20878156 has 24 divisors (see below), whose sum is σ = 39498704. Its totient is φ = 9599040.

The previous prime is 20878133. The next prime is 20878163. The reversal of 20878156 is 65187802.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 16606 + ... + 17818.

Almost surely, 2^20878156 is an apocalyptic number.

20878156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20878156 is a deficient number, since it is larger than the sum of its proper divisors (18620548).

20878156 is a wasteful number, since it uses less digits than its factorization.

20878156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1559 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 20878156 is about 4569.2620848448. The cubic root of 20878156 is about 275.3577976348.

The spelling of 20878156 in words is "twenty million, eight hundred seventy-eight thousand, one hundred fifty-six".