20440806492 has 24 divisors (see below), whose sum is σ = 47719716352. Its totient is φ = 6810102000.

The previous prime is 20440806481. The next prime is 20440806497. The reversal of 20440806492 is 29460804402.

It is a self number, because there is not a number n which added to its sum of digits gives 20440806492.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440806497) 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, 413134 + ... + 459957.

Almost surely, 2^20440806492 is an apocalyptic number.

It is an amenable number.

20440806492 is an abundant number, since it is smaller than the sum of its proper divisors (27278909860).

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

20440806492 is a wasteful number, since it uses less digits than its factorization.

20440806492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875049 (or 875047 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The spelling of 20440806492 in words is "twenty billion, four hundred forty million, eight hundred six thousand, four hundred ninety-two".