20452155738 has 64 divisors (see below), whose sum is σ = 46927614720. Its totient is φ = 5821051392.

The previous prime is 20452155727. The next prime is 20452155739. The reversal of 20452155738 is 83755125402.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 20452155738.

It is not an unprimeable number, because it can be changed into a prime (20452155739) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21826806 + ... + 21827742.

It is an arithmetic number, because the mean of its divisors is an integer number (733243980).

Almost surely, 2^20452155738 is an apocalyptic number.

20452155738 is an abundant number, since it is smaller than the sum of its proper divisors (26475458982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20452155738 is a wasteful number, since it uses less digits than its factorization.

20452155738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2391.

The product of its (nonzero) digits is 336000, while the sum is 42.

The spelling of 20452155738 in words is "twenty billion, four hundred fifty-two million, one hundred fifty-five thousand, seven hundred thirty-eight".