20420400005 has 24 divisors (see below), whose sum is σ = 25937394912. Its totient is φ = 15431439456.

The previous prime is 20420399953. The next prime is 20420400023. The reversal of 20420400005 is 50000402402.

It is not a de Polignac number, because 20420400005 - 2⁸ = 20420399749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 610034 + ... + 642636.

It is an arithmetic number, because the mean of its divisors is an integer number (1080724788).

Almost surely, 2^20420400005 is an apocalyptic number.

It is an amenable number.

20420400005 is a deficient number, since it is larger than the sum of its proper divisors (5516994907).

20420400005 is a wasteful number, since it uses less digits than its factorization.

20420400005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32993 (or 32974 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

Adding to 20420400005 its reverse (50000402402), we get a palindrome (70420802407).

The spelling of 20420400005 in words is "twenty billion, four hundred twenty million, four hundred thousand, five".