20156959 has 2 divisors, whose sum is σ = 20156960. Its totient is φ = 20156958.

The previous prime is 20156933. The next prime is 20156963. The reversal of 20156959 is 95965102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20156959 - 2¹³ = 20148767 is a prime.

It is a super-2 number, since 2×20156959² = 812605992255362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20151959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078479 + 10078480.

It is an arithmetic number, because the mean of its divisors is an integer number (10078480).

Almost surely, 2^20156959 is an apocalyptic number.

20156959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20156959 is an equidigital number, since it uses as much as digits as its factorization.

20156959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 20156959 is about 4489.6502090920. The cubic root of 20156959 is about 272.1499992647.

It can be divided in two parts, 20156 and 959, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20156959 in words is "twenty million, one hundred fifty-six thousand, nine hundred fifty-nine".