20264971988 has 18 divisors (see below), whose sum is σ = 35956197774. Its totient is φ = 9993674304.

The previous prime is 20264971981. The next prime is 20264972069. The reversal of 20264971988 is 88917946202.

It can be written as a sum of positive squares in 3 ways, for example, as 706390084 + 19558581904 = 26578^2 + 139852^2 .

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20264971981) 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, 454031 + ... + 496662.

It is an arithmetic number, because the mean of its divisors is an integer number (1997566543).

Almost surely, 2^20264971988 is an apocalyptic number.

It is an amenable number.

20264971988 is a deficient number, since it is larger than the sum of its proper divisors (15691225786).

20264971988 is an equidigital number, since it uses as much as digits as its factorization.

20264971988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950843 (or 950768 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 20264971988 in words is "twenty billion, two hundred sixty-four million, nine hundred seventy-one thousand, nine hundred eighty-eight".