20523100 has 36 divisors (see below), whose sum is σ = 47963944. Its totient is φ = 7577280.

The previous prime is 20523089. The next prime is 20523103. The reversal of 20523100 is 132502.

It is a super-2 number, since 2×20523100² = 842395267220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523103) 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 11 ways as a sum of consecutive naturals, for example, 6594 + ... + 9193.

Almost surely, 2^20523100 is an apocalyptic number.

20523100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20523100 is an abundant number, since it is smaller than the sum of its proper divisors (27440844).

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

20523100 is a wasteful number, since it uses less digits than its factorization.

20523100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15814 (or 15807 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20523100 is about 4530.2428190992. The cubic root of 20523100 is about 273.7879439769.

Adding to 20523100 its reverse (132502), we get a palindrome (20655602).

The spelling of 20523100 in words is "twenty million, five hundred twenty-three thousand, one hundred".