20402556372 has 120 divisors (see below), whose sum is σ = 58482436320. Its totient is φ = 6150997440.

The previous prime is 20402556367. The next prime is 20402556373. The reversal of 20402556372 is 27365520402.

20402556372 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 25 + 563 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402556373) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 687579 + ... + 716637.

It is an arithmetic number, because the mean of its divisors is an integer number (487353636).

Almost surely, 2^20402556372 is an apocalyptic number.

20402556372 is a gapful number since it is divisible by the number (22) 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 20402556372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29241218160).

20402556372 is an abundant number, since it is smaller than the sum of its proper divisors (38079879948).

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

20402556372 is a wasteful number, since it uses less digits than its factorization.

20402556372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29283 (or 29272 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 36.

The spelling of 20402556372 in words is "twenty billion, four hundred two million, five hundred fifty-six thousand, three hundred seventy-two".