20963720 has 32 divisors (see below), whose sum is σ = 49944600. Its totient is φ = 7891968.

The previous prime is 20963717. The next prime is 20963743. The reversal of 20963720 is 2736902.

It can be written as a sum of positive squares in 4 ways, for example, as 20775364 + 188356 = 4558^2 + 434^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14735 + ... + 16094.

Almost surely, 2^20963720 is an apocalyptic number.

20963720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20963720 is an abundant number, since it is smaller than the sum of its proper divisors (28980880).

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

20963720 is a wasteful number, since it uses less digits than its factorization.

20963720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30857 (or 30853 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20963720 is about 4578.6155112654. The cubic root of 20963720 is about 275.7334470575.

The spelling of 20963720 in words is "twenty million, nine hundred sixty-three thousand, seven hundred twenty".