20957878 has 8 divisors (see below), whose sum is σ = 31456800. Its totient is φ = 10472280.

The previous prime is 20957869. The next prime is 20957903. The reversal of 20957878 is 87875902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3043 + ... + 7153.

It is an arithmetic number, because the mean of its divisors is an integer number (3932100).

Almost surely, 2^20957878 is an apocalyptic number.

20957878 is a deficient number, since it is larger than the sum of its proper divisors (10498922).

20957878 is a wasteful number, since it uses less digits than its factorization.

20957878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 20957878 is about 4577.9775010369. The cubic root of 20957878 is about 275.7078316220.

The spelling of 20957878 in words is "twenty million, nine hundred fifty-seven thousand, eight hundred seventy-eight".