20129311 has 2 divisors, whose sum is σ = 20129312. Its totient is φ = 20129310.

The previous prime is 20129287. The next prime is 20129327. The reversal of 20129311 is 11392102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20129311 - 2¹⁵ = 20096543 is a prime.

It is a super-2 number, since 2×20129311² = 810378322669442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20129371) 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, 10064655 + 10064656.

It is an arithmetic number, because the mean of its divisors is an integer number (10064656).

Almost surely, 2^20129311 is an apocalyptic number.

20129311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20129311 is an equidigital number, since it uses as much as digits as its factorization.

20129311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 20129311 is about 4486.5700707779. The cubic root of 20129311 is about 272.0255121327.

The spelling of 20129311 in words is "twenty million, one hundred twenty-nine thousand, three hundred eleven".