20451015402 has 64 divisors (see below), whose sum is σ = 44608838400. Its totient is φ = 6224311296.

The previous prime is 20451015391. The next prime is 20451015407.

20451015402 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (20451015407) 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, 1309363 + ... + 1324889.

It is an arithmetic number, because the mean of its divisors is an integer number (697013100).

Almost surely, 2^20451015402 is an apocalyptic number.

20451015402 is an abundant number, since it is smaller than the sum of its proper divisors (24157822998).

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

20451015402 is a wasteful number, since it uses less digits than its factorization.

20451015402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15935.

The product of its (nonzero) digits is 1600, while the sum is 24.

It can be divided in two parts, 204510 and 15402, that added together give a palindrome (219912).

The spelling of 20451015402 in words is "twenty billion, four hundred fifty-one million, fifteen thousand, four hundred two".