20431900 has 18 divisors (see below), whose sum is σ = 44337440. Its totient is φ = 8172720.

The previous prime is 20431891. The next prime is 20431913. The reversal of 20431900 is 913402.

It is a super-2 number, since 2×20431900² = 834925075220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102060 + ... + 102259.

Almost surely, 2^20431900 is an apocalyptic number.

20431900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20431900 is an abundant number, since it is smaller than the sum of its proper divisors (23905540).

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

20431900 is a wasteful number, since it uses less digits than its factorization.

20431900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204333 (or 204326 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20431900 is about 4520.1659261580. The cubic root of 20431900 is about 273.3817912632.

The spelling of 20431900 in words is "twenty million, four hundred thirty-one thousand, nine hundred".