20907976320 has 1536 divisors, whose sum is σ = 98985369600. Its totient is φ = 3934126080.

The previous prime is 20907976291. The next prime is 20907976351. The reversal of 20907976320 is 2367970902.

It is a happy number.

20907976320 is a `hidden beast` number, since 2 + 0 + 9 + 0 + 7 + 9 + 7 + 632 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 354372451 + ... + 354372509.

It is an arithmetic number, because the mean of its divisors is an integer number (64443600).

Almost surely, 2^20907976320 is an apocalyptic number.

20907976320 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 20907976320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49492684800).

20907976320 is an abundant number, since it is smaller than the sum of its proper divisors (78077393280).

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

20907976320 is a wasteful number, since it uses less digits than its factorization.

20907976320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The spelling of 20907976320 in words is "twenty billion, nine hundred seven million, nine hundred seventy-six thousand, three hundred twenty".