20420025 has 12 divisors (see below), whose sum is σ = 33761232. Its totient is φ = 10890640.

The previous prime is 20420011. The next prime is 20420027. The reversal of 20420025 is 52002402.

It is not a de Polignac number, because 20420025 - 2⁷ = 20419897 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 20419986 and 20420013.

It is not an unprimeable number, because it can be changed into a prime (20420027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136059 + ... + 136208.

It is an arithmetic number, because the mean of its divisors is an integer number (2813436).

Almost surely, 2^20420025 is an apocalyptic number.

20420025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20420025 is a deficient number, since it is larger than the sum of its proper divisors (13341207).

20420025 is a wasteful number, since it uses less digits than its factorization.

20420025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272280 (or 272275 counting only the distinct ones).

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

The square root of 20420025 is about 4518.8521772680. The cubic root of 20420025 is about 273.3288179240.

Adding to 20420025 its reverse (52002402), we get a palindrome (72422427).

The spelling of 20420025 in words is "twenty million, four hundred twenty thousand, twenty-five".