20018008425 has 24 divisors (see below), whose sum is σ = 33126051424. Its totient is φ = 10666719360.

The previous prime is 20018008399. The next prime is 20018008447. The reversal of 20018008425 is 52480081002.

It is a de Polignac number, because none of the positive numbers 2^k-20018008425 is a prime.

It is a super-2 number, since 2×20018008425² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20018008392 and 20018008401.

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, 34612 + ... + 203061.

Almost surely, 2^20018008425 is an apocalyptic number.

20018008425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20018008425 is a deficient number, since it is larger than the sum of its proper divisors (13108042999).

20018008425 is a wasteful number, since it uses less digits than its factorization.

20018008425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238809 (or 238804 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

Adding to 20018008425 its reverse (52480081002), we get a palindrome (72498089427).

The spelling of 20018008425 in words is "twenty billion, eighteen million, eight thousand, four hundred twenty-five".