20297726240 has 48 divisors (see below), whose sum is σ = 52312780800. Its totient is φ = 7380990720.

The previous prime is 20297726233. The next prime is 20297726243. The reversal of 20297726240 is 4262779202.

It is not an unprimeable number, because it can be changed into a prime (20297726243) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5764640 + ... + 5768159.

It is an arithmetic number, because the mean of its divisors is an integer number (1089849600).

Almost surely, 2^20297726240 is an apocalyptic number.

20297726240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20297726240 is an abundant number, since it is smaller than the sum of its proper divisors (32015054560).

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

20297726240 is a wasteful number, since it uses less digits than its factorization.

20297726240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11532825 (or 11532817 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 20297726240 in words is "twenty billion, two hundred ninety-seven million, seven hundred twenty-six thousand, two hundred forty".