20990377 has 8 divisors (see below), whose sum is σ = 21222432. Its totient is φ = 20760000.

The previous prime is 20990353. The next prime is 20990399. The reversal of 20990377 is 77309902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20990377 - 2¹⁵ = 20957609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20990477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60318 + ... + 60664.

It is an arithmetic number, because the mean of its divisors is an integer number (2652804).

Almost surely, 2^20990377 is an apocalyptic number.

It is an amenable number.

20990377 is a deficient number, since it is larger than the sum of its proper divisors (232055).

20990377 is a wasteful number, since it uses less digits than its factorization.

20990377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839.

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 20990377 is about 4581.5256192670. The cubic root of 20990377 is about 275.8502697275.

The spelling of 20990377 in words is "twenty million, nine hundred ninety thousand, three hundred seventy-seven".