20722169139 has 48 divisors (see below), whose sum is σ = 34923617280. Its totient is φ = 10856099520.

The previous prime is 20722169131. The next prime is 20722169147. The reversal of 20722169139 is 93196122702.

It is an interprime number because it is at equal distance from previous prime (20722169131) and next prime (20722169147).

It is not a de Polignac number, because 20722169139 - 2³ = 20722169131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20722169139.

It is not an unprimeable number, because it can be changed into a prime (20722169131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33084 + ... + 206249.

It is an arithmetic number, because the mean of its divisors is an integer number (727575360).

Almost surely, 2^20722169139 is an apocalyptic number.

20722169139 is a deficient number, since it is larger than the sum of its proper divisors (14201448141).

20722169139 is a wasteful number, since it uses less digits than its factorization.

20722169139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239400 (or 239393 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 20722169139 in words is "twenty billion, seven hundred twenty-two million, one hundred sixty-nine thousand, one hundred thirty-nine".