20878965 has 40 divisors (see below), whose sum is σ = 38658048. Its totient is φ = 10769760.

The previous prime is 20878961. The next prime is 20878969. The reversal of 20878965 is 56987802.

It is an interprime number because it is at equal distance from previous prime (20878961) and next prime (20878969).

It is not a de Polignac number, because 20878965 - 2² = 20878961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20878965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20878961) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11724 + ... + 13386.

Almost surely, 2^20878965 is an apocalyptic number.

It is an amenable number.

20878965 is a deficient number, since it is larger than the sum of its proper divisors (17779083).

20878965 is a wasteful number, since it uses less digits than its factorization.

20878965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 20878965 is about 4569.3506103165. The cubic root of 20878965 is about 275.3613541683.

The spelling of 20878965 in words is "twenty million, eight hundred seventy-eight thousand, nine hundred sixty-five".