20420232401 has 4 divisors (see below), whose sum is σ = 20972130612. Its totient is φ = 19868334192.

The previous prime is 20420232389. The next prime is 20420232421. The reversal of 20420232401 is 10423202402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10423202402 = 2 ⋅5211601201.

It can be written as a sum of positive squares in 2 ways, for example, as 16441650625 + 3978581776 = 128225^2 + 63076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20420232401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20420232421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275949050 + ... + 275949123.

It is an arithmetic number, because the mean of its divisors is an integer number (5243032653).

Almost surely, 2^20420232401 is an apocalyptic number.

It is an amenable number.

20420232401 is a deficient number, since it is larger than the sum of its proper divisors (551898211).

20420232401 is an equidigital number, since it uses as much as digits as its factorization.

20420232401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551898210.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20420232401 its reverse (10423202402), we get a palindrome (30843434803).

The spelling of 20420232401 in words is "twenty billion, four hundred twenty million, two hundred thirty-two thousand, four hundred one".