20351404155 has 16 divisors (see below), whose sum is σ = 32606687520. Its totient is φ = 10839268608.

The previous prime is 20351404109. The next prime is 20351404163. The reversal of 20351404155 is 55140415302.

It is not a de Polignac number, because 20351404155 - 2⁹ = 20351403643 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 914490 + ... + 936479.

It is an arithmetic number, because the mean of its divisors is an integer number (2037917970).

Almost surely, 2^20351404155 is an apocalyptic number.

20351404155 is a deficient number, since it is larger than the sum of its proper divisors (12255283365).

20351404155 is a wasteful number, since it uses less digits than its factorization.

20351404155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851710.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 20351404155 its reverse (55140415302), we get a palindrome (75491819457).

The spelling of 20351404155 in words is "twenty billion, three hundred fifty-one million, four hundred four thousand, one hundred fifty-five".