20431902 has 16 divisors (see below), whose sum is σ = 41029632. Its totient is φ = 6783000.

The previous prime is 20431891. The next prime is 20431913. The reversal of 20431902 is 20913402.

It is an interprime number because it is at equal distance from previous prime (20431891) and next prime (20431913).

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, 5278 + ... + 8289.

It is an arithmetic number, because the mean of its divisors is an integer number (2564352).

Almost surely, 2^20431902 is an apocalyptic number.

20431902 is an abundant number, since it is smaller than the sum of its proper divisors (20597730).

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

20431902 is a wasteful number, since it uses less digits than its factorization.

20431902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13823.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20431902 is about 4520.1661473888. The cubic root of 20431902 is about 273.3818001833.

The spelling of 20431902 in words is "twenty million, four hundred thirty-one thousand, nine hundred two".