20902159 has 2 divisors, whose sum is σ = 20902160. Its totient is φ = 20902158.

The previous prime is 20902121. The next prime is 20902177. The reversal of 20902159 is 95120902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20902159 - 2⁷ = 20902031 is a prime.

It is a super-2 number, since 2×20902159² = 873800501722562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20932159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451079 + 10451080.

It is an arithmetic number, because the mean of its divisors is an integer number (10451080).

Almost surely, 2^20902159 is an apocalyptic number.

20902159 is a deficient number, since it is larger than the sum of its proper divisors (1).

20902159 is an equidigital number, since it uses as much as digits as its factorization.

20902159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 20902159 is about 4571.8879032627. The cubic root of 20902159 is about 275.4632808003.

The spelling of 20902159 in words is "twenty million, nine hundred two thousand, one hundred fifty-nine".