20938995920 has 40 divisors (see below), whose sum is σ = 49129820520. Its totient is φ = 8298754560.

The previous prime is 20938995907. The next prime is 20938995977. The reversal of 20938995920 is 2959983902.

It can be written as a sum of positive squares in 4 ways, for example, as 6248586304 + 14690409616 = 79048^2 + 121204^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1191911 + ... + 1209350.

It is an arithmetic number, because the mean of its divisors is an integer number (1228245513).

Almost surely, 2^20938995920 is an apocalyptic number.

20938995920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20938995920 is an abundant number, since it is smaller than the sum of its proper divisors (28190824600).

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

20938995920 is a wasteful number, since it uses less digits than its factorization.

20938995920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401383 (or 2401377 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 56.

The spelling of 20938995920 in words is "twenty billion, nine hundred thirty-eight million, nine hundred ninety-five thousand, nine hundred twenty".