20122939 has 4 divisors (see below), whose sum is σ = 20137320. Its totient is φ = 20108560.

The previous prime is 20122903. The next prime is 20122979. The reversal of 20122939 is 93922102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20122979) 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 in 3 ways as a sum of consecutive naturals, for example, 4834 + ... + 7975.

It is an arithmetic number, because the mean of its divisors is an integer number (5034330).

Almost surely, 2^20122939 is an apocalyptic number.

20122939 is a deficient number, since it is larger than the sum of its proper divisors (14381).

20122939 is a wasteful number, since it uses less digits than its factorization.

20122939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14380.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20122939 is about 4485.8598952709. The cubic root of 20122939 is about 271.9968055781.

The spelling of 20122939 in words is "twenty million, one hundred twenty-two thousand, nine hundred thirty-nine".