20402251163 has 4 divisors (see below), whose sum is σ = 23316858480. Its totient is φ = 17487643848.

The previous prime is 20402251127. The next prime is 20402251183. The reversal of 20402251163 is 36115220402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20402251163 - 2¹⁸ = 20401989019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402251183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1457303648 + ... + 1457303661.

It is an arithmetic number, because the mean of its divisors is an integer number (5829214620).

Almost surely, 2^20402251163 is an apocalyptic number.

20402251163 is a deficient number, since it is larger than the sum of its proper divisors (2914607317).

20402251163 is an equidigital number, since it uses as much as digits as its factorization.

20402251163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2914607316.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 20402251163 its reverse (36115220402), we get a palindrome (56517471565).

The spelling of 20402251163 in words is "twenty billion, four hundred two million, two hundred fifty-one thousand, one hundred sixty-three".