20977886 has 32 divisors (see below), whose sum is σ = 34725888. Its totient is φ = 9472320.

The previous prime is 20977871. The next prime is 20977889. The reversal of 20977886 is 68877902.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 20977886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66866 + ... + 67178.

It is an arithmetic number, because the mean of its divisors is an integer number (1085184).

Almost surely, 2^20977886 is an apocalyptic number.

20977886 is a deficient number, since it is larger than the sum of its proper divisors (13748002).

20977886 is a wasteful number, since it uses less digits than its factorization.

20977886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 20977886 is about 4580.1622242012. The cubic root of 20977886 is about 275.7955410071.

The spelling of 20977886 in words is "twenty million, nine hundred seventy-seven thousand, eight hundred eighty-six".