20961396 has 24 divisors (see below), whose sum is σ = 54344640. Its totient is φ = 6987096.

The previous prime is 20961377. The next prime is 20961397. The reversal of 20961396 is 69316902.

20961396 is a `hidden beast` number, since 209 + 61 + 396 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20961396.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20961397) 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, 96936 + ... + 97151.

It is an arithmetic number, because the mean of its divisors is an integer number (2264360).

Almost surely, 2^20961396 is an apocalyptic number.

It is an amenable number.

20961396 is an abundant number, since it is smaller than the sum of its proper divisors (33383244).

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

20961396 is a wasteful number, since it uses less digits than its factorization.

20961396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194100 (or 194092 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 20961396 is about 4578.3617157232. The cubic root of 20961396 is about 275.7232575775.

The spelling of 20961396 in words is "twenty million, nine hundred sixty-one thousand, three hundred ninety-six".