20145620 has 24 divisors (see below), whose sum is σ = 46152288. Its totient is φ = 7325600.

The previous prime is 20145617. The next prime is 20145673. The reversal of 20145620 is 2654102.

It is a happy number.

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 = 20145592 and 20145601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45566 + ... + 46005.

It is an arithmetic number, because the mean of its divisors is an integer number (1923012).

Almost surely, 2^20145620 is an apocalyptic number.

20145620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145620 is an abundant number, since it is smaller than the sum of its proper divisors (26006668).

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

20145620 is a wasteful number, since it uses less digits than its factorization.

20145620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91591 (or 91589 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20145620 is about 4488.3872381959. The cubic root of 20145620 is about 272.0989583700.

Adding to 20145620 its reverse (2654102), we get a palindrome (22799722).

The spelling of 20145620 in words is "twenty million, one hundred forty-five thousand, six hundred twenty".