20977926 has 16 divisors (see below), whose sum is σ = 42044400. Its totient is φ = 6977888.

The previous prime is 20977889. The next prime is 20977951. The reversal of 20977926 is 62977902.

It is a super-2 number, since 2×20977926² = 880146758522952, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (2627775).

Almost surely, 2^20977926 is an apocalyptic number.

20977926 is an abundant number, since it is smaller than the sum of its proper divisors (21066474).

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

20977926 is a wasteful number, since it uses less digits than its factorization.

20977926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7383.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 20977926 is about 4580.1665908567. The cubic root of 20977926 is about 275.7957162998.

The spelling of 20977926 in words is "twenty million, nine hundred seventy-seven thousand, nine hundred twenty-six".