20417256220 has 48 divisors (see below), whose sum is σ = 43188526080. Its totient is φ = 8107628864.

The previous prime is 20417256217. The next prime is 20417256247. The reversal of 20417256220 is 2265271402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1623597 + ... + 1636123.

It is an arithmetic number, because the mean of its divisors is an integer number (899760960).

Almost surely, 2^20417256220 is an apocalyptic number.

20417256220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20417256220 is an abundant number, since it is smaller than the sum of its proper divisors (22771269860).

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

20417256220 is a wasteful number, since it uses less digits than its factorization.

20417256220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13122 (or 13120 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The spelling of 20417256220 in words is "twenty billion, four hundred seventeen million, two hundred fifty-six thousand, two hundred twenty".