20878756 has 12 divisors (see below), whose sum is σ = 38126592. Its totient is φ = 9985448.

The previous prime is 20878751. The next prime is 20878769. The reversal of 20878756 is 65787802.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20878751) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 113380 + ... + 113563.

It is an arithmetic number, because the mean of its divisors is an integer number (3177216).

Almost surely, 2^20878756 is an apocalyptic number.

It is an amenable number.

20878756 is a deficient number, since it is larger than the sum of its proper divisors (17247836).

20878756 is a wasteful number, since it uses less digits than its factorization.

20878756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226970 (or 226968 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 20878756 is about 4569.3277404887. The cubic root of 20878756 is about 275.3604353693.

The spelling of 20878756 in words is "twenty million, eight hundred seventy-eight thousand, seven hundred fifty-six".