20977620 has 48 divisors (see below), whose sum is σ = 59051328. Its totient is φ = 5564160.

The previous prime is 20977613. The next prime is 20977657. The reversal of 20977620 is 2677902.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11832 + ... + 13488.

It is an arithmetic number, because the mean of its divisors is an integer number (1230236).

Almost surely, 2^20977620 is an apocalyptic number.

20977620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20977620 is an abundant number, since it is smaller than the sum of its proper divisors (38073708).

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

20977620 is a wasteful number, since it uses less digits than its factorization.

20977620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20977620 is about 4580.1331858364. The cubic root of 20977620 is about 275.7943753046.

The spelling of 20977620 in words is "twenty million, nine hundred seventy-seven thousand, six hundred twenty".