20974459240 has 128 divisors (see below), whose sum is σ = 57175372800. Its totient is φ = 6760120320.

The previous prime is 20974459237. The next prime is 20974459243. The reversal of 20974459240 is 4295447902.

It is an interprime number because it is at equal distance from previous prime (20974459237) and next prime (20974459243).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20974459243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4943520 + ... + 4947760.

It is an arithmetic number, because the mean of its divisors is an integer number (446682600).

Almost surely, 2^20974459240 is an apocalyptic number.

20974459240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20974459240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28587686400).

20974459240 is an abundant number, since it is smaller than the sum of its proper divisors (36200913560).

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

20974459240 is a wasteful number, since it uses less digits than its factorization.

20974459240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5315 (or 5311 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 20974459240 in words is "twenty billion, nine hundred seventy-four million, four hundred fifty-nine thousand, two hundred forty".