20420000025 has 24 divisors (see below), whose sum is σ = 34003969440. Its totient is φ = 10812311040.

The previous prime is 20419999949. The next prime is 20420000063. The reversal of 20420000025 is 52000002402.

It is not a de Polignac number, because 20420000025 - 2¹⁵ = 20419967257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20419999959 and 20420000013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 968952 + ... + 989801.

It is an arithmetic number, because the mean of its divisors is an integer number (1416832060).

Almost surely, 2^20420000025 is an apocalyptic number.

20420000025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20420000025 is a deficient number, since it is larger than the sum of its proper divisors (13583969415).

20420000025 is a wasteful number, since it uses less digits than its factorization.

20420000025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958905 (or 1958900 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

Adding to 20420000025 its reverse (52000002402), we get a palindrome (72420002427).

The spelling of 20420000025 in words is "twenty billion, four hundred twenty million, twenty-five", and thus it is an aban number.