20877397 has 4 divisors (see below), whose sum is σ = 20899456. Its totient is φ = 20855340.

The previous prime is 20877391. The next prime is 20877431. The reversal of 20877397 is 79377802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20877397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20877391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9543 + ... + 11524.

It is an arithmetic number, because the mean of its divisors is an integer number (5224864).

Almost surely, 2^20877397 is an apocalyptic number.

It is an amenable number.

20877397 is a deficient number, since it is larger than the sum of its proper divisors (22059).

20877397 is an equidigital number, since it uses as much as digits as its factorization.

20877397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22058.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 20877397 is about 4569.1790291036. The cubic root of 20877397 is about 275.3544608283.

The spelling of 20877397 in words is "twenty million, eight hundred seventy-seven thousand, three hundred ninety-seven".