20404242425 has 48 divisors (see below), whose sum is σ = 30283514112. Its totient is φ = 13334112000.

The previous prime is 20404242413. The next prime is 20404242427. The reversal of 20404242425 is 52424240402.

It is not a de Polignac number, because 20404242425 - 2¹⁰ = 20404241401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20404242427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1105775 + ... + 1124075.

It is an arithmetic number, because the mean of its divisors is an integer number (630906544).

Almost surely, 2^20404242425 is an apocalyptic number.

20404242425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20404242425 is a deficient number, since it is larger than the sum of its proper divisors (9879271687).

20404242425 is a wasteful number, since it uses less digits than its factorization.

20404242425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18618 (or 18613 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 29.

Adding to 20404242425 its reverse (52424240402), we get a palindrome (72828482827).

The spelling of 20404242425 in words is "twenty billion, four hundred four million, two hundred forty-two thousand, four hundred twenty-five".