20902801 has 2 divisors, whose sum is σ = 20902802. Its totient is φ = 20902800.

The previous prime is 20902787. The next prime is 20902811. The reversal of 20902801 is 10820902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14137600 + 6765201 = 3760^2 + 2601^2 .

It is a cyclic number.

It is not a de Polignac number, because 20902801 - 2⁵ = 20902769 is a prime.

It is not a weakly prime, because it can be changed into another prime (20902811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451400 + 10451401.

It is an arithmetic number, because the mean of its divisors is an integer number (10451401).

Almost surely, 2^20902801 is an apocalyptic number.

It is an amenable number.

20902801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20902801 is an equidigital number, since it uses as much as digits as its factorization.

20902801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20902801 is about 4571.9581144188. The cubic root of 20902801 is about 275.4661010132.

The spelling of 20902801 in words is "twenty million, nine hundred two thousand, eight hundred one".