20968155 has 48 divisors (see below), whose sum is σ = 39757536. Its totient is φ = 10160640.

The previous prime is 20968141. The next prime is 20968177. The reversal of 20968155 is 55186902.

It is a happy number.

It is not a de Polignac number, because 20968155 - 2⁴ = 20968139 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42460 + ... + 42950.

It is an arithmetic number, because the mean of its divisors is an integer number (828282).

Almost surely, 2^20968155 is an apocalyptic number.

20968155 is a deficient number, since it is larger than the sum of its proper divisors (18789381).

20968155 is a wasteful number, since it uses less digits than its factorization.

20968155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 20968155 is about 4579.0998023629. The cubic root of 20968155 is about 275.7528900382.

The spelling of 20968155 in words is "twenty million, nine hundred sixty-eight thousand, one hundred fifty-five".