20431532236 has 24 divisors (see below), whose sum is σ = 36062165216. Its totient is φ = 10128343680.

The previous prime is 20431532221. The next prime is 20431532239. The reversal of 20431532236 is 63223513402.

It is a junction number, because it is equal to n+sod(n) for n = 20431532198 and 20431532207.

It is not an unprimeable number, because it can be changed into a prime (20431532239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251401 + ... + 322591.

Almost surely, 2^20431532236 is an apocalyptic number.

It is an amenable number.

20431532236 is a deficient number, since it is larger than the sum of its proper divisors (15630632980).

20431532236 is a wasteful number, since it uses less digits than its factorization.

20431532236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71809 (or 71807 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The spelling of 20431532236 in words is "twenty billion, four hundred thirty-one million, five hundred thirty-two thousand, two hundred thirty-six".