20877660 has 36 divisors (see below), whose sum is σ = 63329448. Its totient is φ = 5567328.

The previous prime is 20877643. The next prime is 20877667. The reversal of 20877660 is 6677802.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20877667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57814 + ... + 58173.

Almost surely, 2^20877660 is an apocalyptic number.

20877660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20877660 is an abundant number, since it is smaller than the sum of its proper divisors (42451788).

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

20877660 is a wasteful number, since it uses less digits than its factorization.

20877660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116002 (or 115997 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 20877660 is about 4569.2078088001. The cubic root of 20877660 is about 275.3556170695.

The spelling of 20877660 in words is "twenty million, eight hundred seventy-seven thousand, six hundred sixty".