20981924420 has 24 divisors (see below), whose sum is σ = 44619792000. Its totient is φ = 8286531552.

The previous prime is 20981924413. The next prime is 20981924423. The reversal of 20981924420 is 2442918902.

It is not an unprimeable number, because it can be changed into a prime (20981924423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6638270 + ... + 6641429.

It is an arithmetic number, because the mean of its divisors is an integer number (1859158000).

Almost surely, 2^20981924420 is an apocalyptic number.

20981924420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20981924420 is an abundant number, since it is smaller than the sum of its proper divisors (23637867580).

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

20981924420 is a wasteful number, since it uses less digits than its factorization.

20981924420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13279787 (or 13279785 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 20981924420 in words is "twenty billion, nine hundred eighty-one million, nine hundred twenty-four thousand, four hundred twenty".