20751274944 has 168 divisors, whose sum is σ = 63065162160. Its totient is φ = 6501261312.

The previous prime is 20751274931. The next prime is 20751274969. The reversal of 20751274944 is 44947215702.

20751274944 is a `hidden beast` number, since 20 + 7 + 512 + 74 + 9 + 44 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20751274944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13992027 + ... + 13993509.

It is an arithmetic number, because the mean of its divisors is an integer number (375387870).

Almost surely, 2^20751274944 is an apocalyptic number.

20751274944 is a gapful number since it is divisible by the number (24) 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 20751274944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31532581080).

20751274944 is an abundant number, since it is smaller than the sum of its proper divisors (42313887216).

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

20751274944 is a wasteful number, since it uses less digits than its factorization.

20751274944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947 (or 2934 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 20751274944 in words is "twenty billion, seven hundred fifty-one million, two hundred seventy-four thousand, nine hundred forty-four".