20005423155 has 12 divisors (see below), whose sum is σ = 34676066880. Its totient is φ = 10669558992.

The previous prime is 20005423153. The next prime is 20005423213. The reversal of 20005423155 is 55132450002.

It is a happy number.

It is not a de Polignac number, because 20005423155 - 2¹ = 20005423153 is a prime.

It is a super-2 number, since 2×20005423155² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20005423153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222282435 + ... + 222282524.

It is an arithmetic number, because the mean of its divisors is an integer number (2889672240).

Almost surely, 2^20005423155 is an apocalyptic number.

20005423155 is a deficient number, since it is larger than the sum of its proper divisors (14670643725).

20005423155 is a wasteful number, since it uses less digits than its factorization.

20005423155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444564970 (or 444564967 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 20005423155 its reverse (55132450002), we get a palindrome (75137873157).

The spelling of 20005423155 in words is "twenty billion, five million, four hundred twenty-three thousand, one hundred fifty-five".