20423254005 has 64 divisors (see below), whose sum is σ = 45267148800. Its totient is φ = 8487581760.

The previous prime is 20423254001. The next prime is 20423254013. The reversal of 20423254005 is 50045232402.

It is a happy number.

20423254005 is a `hidden beast` number, since 20 + 4 + 232 + 5 + 400 + 5 = 666.

It is not a de Polignac number, because 20423254005 - 2² = 20423254001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20423254005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423254001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 971965 + ... + 992754.

It is an arithmetic number, because the mean of its divisors is an integer number (707299200).

Almost surely, 2^20423254005 is an apocalyptic number.

It is an amenable number.

20423254005 is an abundant number, since it is smaller than the sum of its proper divisors (24843894795).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20423254005 is a wasteful number, since it uses less digits than its factorization.

20423254005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964751 (or 1964745 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

Adding to 20423254005 its reverse (50045232402), we get a palindrome (70468486407).

The spelling of 20423254005 in words is "twenty billion, four hundred twenty-three million, two hundred fifty-four thousand, five".