20442756123 has 12 divisors (see below), whose sum is σ = 29592207840. Its totient is φ = 13599066096.

The previous prime is 20442756097. The next prime is 20442756133. The reversal of 20442756123 is 32165724402.

20442756123 is a `hidden beast` number, since 20 + 442 + 75 + 6 + 123 = 666.

It is not a de Polignac number, because 20442756123 - 2¹⁸ = 20442493979 is a prime.

It is a super-2 number, since 2×20442756123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20442756133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2448768 + ... + 2457101.

It is an arithmetic number, because the mean of its divisors is an integer number (2466017320).

Almost surely, 2^20442756123 is an apocalyptic number.

20442756123 is a deficient number, since it is larger than the sum of its proper divisors (9149451717).

20442756123 is a wasteful number, since it uses less digits than its factorization.

20442756123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4906338 (or 4906335 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The spelling of 20442756123 in words is "twenty billion, four hundred forty-two million, seven hundred fifty-six thousand, one hundred twenty-three".