20877617 has 2 divisors, whose sum is σ = 20877618. Its totient is φ = 20877616.

The previous prime is 20877613. The next prime is 20877631. The reversal of 20877617 is 71677802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11397376 + 9480241 = 3376^2 + 3079^2 .

It is a cyclic number.

It is not a de Polignac number, because 20877617 - 2² = 20877613 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20877611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10438808 + 10438809.

It is an arithmetic number, because the mean of its divisors is an integer number (10438809).

Almost surely, 2^20877617 is an apocalyptic number.

It is an amenable number.

20877617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20877617 is an equidigital number, since it uses as much as digits as its factorization.

20877617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 20877617 is about 4569.2031033868. The cubic root of 20877617 is about 275.3554280269.

The spelling of 20877617 in words is "twenty million, eight hundred seventy-seven thousand, six hundred seventeen".