20961336 has 32 divisors (see below), whose sum is σ = 57168000. Its totient is φ = 6351840.

The previous prime is 20961329. The next prime is 20961337. The reversal of 20961336 is 63316902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20961337) 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, 39436 + ... + 39963.

It is an arithmetic number, because the mean of its divisors is an integer number (1786500).

Almost surely, 2^20961336 is an apocalyptic number.

It is an amenable number.

20961336 is an abundant number, since it is smaller than the sum of its proper divisors (36206664).

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

20961336 is a wasteful number, since it uses less digits than its factorization.

20961336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79419 (or 79415 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 20961336 is about 4578.3551631563. The cubic root of 20961336 is about 275.7229945001.

The spelling of 20961336 in words is "twenty million, nine hundred sixty-one thousand, three hundred thirty-six".