20907421920 has 1440 divisors, whose sum is σ = 97233133536. Its totient is φ = 4180377600.

The previous prime is 20907421819. The next prime is 20907421939. The reversal of 20907421920 is 2912470902.

20907421920 is a `hidden beast` number, since 209 + 0 + 7 + 421 + 9 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (1440).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 286403004 + ... + 286403076.

Almost surely, 2^20907421920 is an apocalyptic number.

20907421920 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 20907421920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48616566768).

20907421920 is an abundant number, since it is smaller than the sum of its proper divisors (76325711616).

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

20907421920 is a wasteful number, since it uses less digits than its factorization.

20907421920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 20907421920 in words is "twenty billion, nine hundred seven million, four hundred twenty-one thousand, nine hundred twenty".