20977806 has 16 divisors (see below), whose sum is σ = 42076800. Its totient is φ = 6972408.

The previous prime is 20977799. The next prime is 20977811. The reversal of 20977806 is 60877902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2716 + ... + 7023.

It is an arithmetic number, because the mean of its divisors is an integer number (2629800).

Almost surely, 2^20977806 is an apocalyptic number.

20977806 is an abundant number, since it is smaller than the sum of its proper divisors (21098994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20977806 is a wasteful number, since it uses less digits than its factorization.

20977806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10103.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 20977806 is about 4580.1534908778. The cubic root of 20977806 is about 275.7951904209.

The spelling of 20977806 in words is "twenty million, nine hundred seventy-seven thousand, eight hundred six".