20898677 has 2 divisors, whose sum is σ = 20898678. Its totient is φ = 20898676.

The previous prime is 20898667. The next prime is 20898737. The reversal of 20898677 is 77689802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12453841 + 8444836 = 3529^2 + 2906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20898677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20898667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10449338 + 10449339.

It is an arithmetic number, because the mean of its divisors is an integer number (10449339).

Almost surely, 2^20898677 is an apocalyptic number.

It is an amenable number.

20898677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20898677 is an equidigital number, since it uses as much as digits as its factorization.

20898677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 20898677 is about 4571.5070819151. The cubic root of 20898677 is about 275.4479838731.

The spelling of 20898677 in words is "twenty million, eight hundred ninety-eight thousand, six hundred seventy-seven".