20119639 has 2 divisors, whose sum is σ = 20119640. Its totient is φ = 20119638.

The previous prime is 20119637. The next prime is 20119661. The reversal of 20119639 is 93691102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20119639 - 2¹ = 20119637 is a prime.

Together with 20119637, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20119639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20119633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10059819 + 10059820.

It is an arithmetic number, because the mean of its divisors is an integer number (10059820).

Almost surely, 2^20119639 is an apocalyptic number.

20119639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20119639 is an equidigital number, since it uses as much as digits as its factorization.

20119639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 20119639 is about 4485.4920577346. The cubic root of 20119639 is about 271.9819363365.

The spelling of 20119639 in words is "twenty million, one hundred nineteen thousand, six hundred thirty-nine".