20132639 has 2 divisors, whose sum is σ = 20132640. Its totient is φ = 20132638.

The previous prime is 20132617. The next prime is 20132683. The reversal of 20132639 is 93623102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20132639 - 2²⁰ = 19084063 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20132939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066319 + 10066320.

It is an arithmetic number, because the mean of its divisors is an integer number (10066320).

Almost surely, 2^20132639 is an apocalyptic number.

20132639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20132639 is an equidigital number, since it uses as much as digits as its factorization.

20132639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 20132639 is about 4486.9409401061. The cubic root of 20132639 is about 272.0405027272.

The spelling of 20132639 in words is "twenty million, one hundred thirty-two thousand, six hundred thirty-nine".