20431938492 has 72 divisors (see below), whose sum is σ = 59138841216. Its totient is φ = 5826497184.

The previous prime is 20431938433. The next prime is 20431938503. The reversal of 20431938492 is 29483913402.

It is a super-2 number, since 2×20431938492² (a number of 21 digits) 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 23 ways as a sum of consecutive naturals, for example, 54283 + ... + 209309.

Almost surely, 2^20431938492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431938492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29569420608).

20431938492 is an abundant number, since it is smaller than the sum of its proper divisors (38706902724).

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

20431938492 is a wasteful number, since it uses less digits than its factorization.

20431938492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155567 (or 155562 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 20431938492 in words is "twenty billion, four hundred thirty-one million, nine hundred thirty-eight thousand, four hundred ninety-two".