20977863 has 16 divisors (see below), whose sum is σ = 29687040. Its totient is φ = 13147904.

The previous prime is 20977861. The next prime is 20977871. The reversal of 20977863 is 36877902.

It is not a de Polignac number, because 20977863 - 2¹ = 20977861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977861) 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, 1495 + ... + 6647.

It is an arithmetic number, because the mean of its divisors is an integer number (1855440).

Almost surely, 2^20977863 is an apocalyptic number.

20977863 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20977863 is a deficient number, since it is larger than the sum of its proper divisors (8709177).

20977863 is a wasteful number, since it uses less digits than its factorization.

20977863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 20977863 is about 4580.1597133724. The cubic root of 20977863 is about 275.7954402136.

The spelling of 20977863 in words is "twenty million, nine hundred seventy-seven thousand, eight hundred sixty-three".