20402231455 has 4 divisors (see below), whose sum is σ = 24482677752. Its totient is φ = 16321785160.

The previous prime is 20402231429. The next prime is 20402231461. The reversal of 20402231455 is 55413220402.

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

It is not a de Polignac number, because 20402231455 - 2⁷ = 20402231327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040223141 + ... + 2040223150.

It is an arithmetic number, because the mean of its divisors is an integer number (6120669438).

Almost surely, 2^20402231455 is an apocalyptic number.

20402231455 is a deficient number, since it is larger than the sum of its proper divisors (4080446297).

20402231455 is an equidigital number, since it uses as much as digits as its factorization.

20402231455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080446296.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 20402231455 its reverse (55413220402), we get a palindrome (75815451857).

The spelling of 20402231455 in words is "twenty billion, four hundred two million, two hundred thirty-one thousand, four hundred fifty-five".