20436902451 has 16 divisors (see below), whose sum is σ = 34602163200. Its totient is φ = 11678229864.

The previous prime is 20436902441. The next prime is 20436902467. The reversal of 20436902451 is 15420963402.

It is a happy number.

It is not a de Polignac number, because 20436902451 - 2⁵ = 20436902419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20436902401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54065691 + ... + 54066068.

It is an arithmetic number, because the mean of its divisors is an integer number (2162635200).

Almost surely, 2^20436902451 is an apocalyptic number.

20436902451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20436902451 is a deficient number, since it is larger than the sum of its proper divisors (14165260749).

20436902451 is a wasteful number, since it uses less digits than its factorization.

20436902451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108131775 (or 108131769 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20436902451 in words is "twenty billion, four hundred thirty-six million, nine hundred two thousand, four hundred fifty-one".