20420100131 has 4 divisors (see below), whose sum is σ = 20421819600. Its totient is φ = 20418380664.

The previous prime is 20420100119. The next prime is 20420100139. The reversal of 20420100131 is 13100102402.

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

It is a cyclic number.

It is not a de Polignac number, because 20420100131 - 2⁶ = 20420100067 is a prime.

It is a super-2 number, since 2×20420100131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20420100139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841796 + ... + 865713.

It is an arithmetic number, because the mean of its divisors is an integer number (5105454900).

Almost surely, 2^20420100131 is an apocalyptic number.

20420100131 is a deficient number, since it is larger than the sum of its proper divisors (1719469).

20420100131 is a wasteful number, since it uses less digits than its factorization.

20420100131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719468.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20420100131 its reverse (13100102402), we get a palindrome (33520202533).

The spelling of 20420100131 in words is "twenty billion, four hundred twenty million, one hundred thousand, one hundred thirty-one".