109512020 has 24 divisors (see below), whose sum is σ = 231525000. Its totient is φ = 43509632.

The previous prime is 109512017. The next prime is 109512023. The reversal of 109512020 is 20215901.

It is an interprime number because it is at equal distance from previous prime (109512017) and next prime (109512023).

It can be written as a sum of positive squares in 4 ways, for example, as 1435204 + 108076816 = 1198^2 + 10396^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 109511983 and 109512001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109512023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15395 + ... + 21354.

It is an arithmetic number, because the mean of its divisors is an integer number (9646875).

Almost surely, 2^109512020 is an apocalyptic number.

109512020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

109512020 is an abundant number, since it is smaller than the sum of its proper divisors (122012980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

109512020 is a wasteful number, since it uses less digits than its factorization.

109512020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36907 (or 36905 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 109512020 is about 10464.7990902836. The cubic root of 109512020 is about 478.4324150864.

Adding to 109512020 its reverse (20215901), we get a palindrome (129727921).

It can be divided in two parts, 1095120 and 20, that multiplied together give a square (21902400 = 4680²).

The spelling of 109512020 in words is "one hundred nine million, five hundred twelve thousand, twenty".