20425252220 has 24 divisors (see below), whose sum is σ = 43317717408. Its totient is φ = 8089208000.

The previous prime is 20425252217. The next prime is 20425252229. The reversal of 20425252220 is 2225252402.

It is a super-2 number, since 2×20425252220² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20425252220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425252229) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5053736 + ... + 5057775.

It is an arithmetic number, because the mean of its divisors is an integer number (1804904892).

Almost surely, 2^20425252220 is an apocalyptic number.

20425252220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20425252220 is an abundant number, since it is smaller than the sum of its proper divisors (22892465188).

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

20425252220 is a wasteful number, since it uses less digits than its factorization.

20425252220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10111621 (or 10111619 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The spelling of 20425252220 in words is "twenty billion, four hundred twenty-five million, two hundred fifty-two thousand, two hundred twenty".