20154531402 has 64 divisors (see below), whose sum is σ = 46972949760. Its totient is φ = 6393385152.

The previous prime is 20154531349. The next prime is 20154531421. The reversal of 20154531402 is 20413545102.

20154531402 is a `hidden beast` number, since 201 + 5 + 4 + 53 + 1 + 402 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203488 + ... + 285860.

It is an arithmetic number, because the mean of its divisors is an integer number (733952340).

Almost surely, 2^20154531402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20154531402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23486474880).

20154531402 is an abundant number, since it is smaller than the sum of its proper divisors (26818418358).

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

20154531402 is a wasteful number, since it uses less digits than its factorization.

20154531402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82604 (or 82598 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 20154531402 in words is "twenty billion, one hundred fifty-four million, five hundred thirty-one thousand, four hundred two".