20451264724 has 48 divisors (see below), whose sum is σ = 42219636480. Its totient is φ = 8563036160.

The previous prime is 20451264709. The next prime is 20451264731. The reversal of 20451264724 is 42746215402.

It is a super-2 number, since 2×20451264724² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255709 + ... + 326020.

It is an arithmetic number, because the mean of its divisors is an integer number (879575760).

Almost surely, 2^20451264724 is an apocalyptic number.

It is an amenable number.

20451264724 is an abundant number, since it is smaller than the sum of its proper divisors (21768371756).

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

20451264724 is a wasteful number, since it uses less digits than its factorization.

20451264724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581808 (or 581806 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 37.

The spelling of 20451264724 in words is "twenty billion, four hundred fifty-one million, two hundred sixty-four thousand, seven hundred twenty-four".