20425220 has 12 divisors (see below), whose sum is σ = 42893004. Its totient is φ = 8170080.

The previous prime is 20425217. The next prime is 20425231. The reversal of 20425220 is 2252402.

It can be written as a sum of positive squares in 2 ways, for example, as 14500864 + 5924356 = 3808^2 + 2434^2 .

It is a super-2 number, since 2×20425220² = 834379224096800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510611 + ... + 510650.

It is an arithmetic number, because the mean of its divisors is an integer number (3574417).

Almost surely, 2^20425220 is an apocalyptic number.

20425220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20425220 is an abundant number, since it is smaller than the sum of its proper divisors (22467784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20425220 is a wasteful number, since it uses less digits than its factorization.

20425220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021270 (or 1021268 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20425220 is about 4519.4269548251. The cubic root of 20425220 is about 273.3519948922.

Adding to 20425220 its reverse (2252402), we get a palindrome (22677622).

The spelling of 20425220 in words is "twenty million, four hundred twenty-five thousand, two hundred twenty".