20642407772 has 18 divisors (see below), whose sum is σ = 42022044792. Its totient is φ = 8846746104.

The previous prime is 20642407771. The next prime is 20642407787. The reversal of 20642407772 is 27770424602.

It is a super-2 number, since 2×20642407772² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642407771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52659008 + ... + 52659399.

It is an arithmetic number, because the mean of its divisors is an integer number (2334558044).

Almost surely, 2^20642407772 is an apocalyptic number.

It is an amenable number.

20642407772 is an abundant number, since it is smaller than the sum of its proper divisors (21379637020).

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

20642407772 is a wasteful number, since it uses less digits than its factorization.

20642407772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105318425 (or 105318416 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 41.

The spelling of 20642407772 in words is "twenty billion, six hundred forty-two million, four hundred seven thousand, seven hundred seventy-two".