20225431688 has 108 divisors (see below), whose sum is σ = 48563469045. Its totient is φ = 7867970880.

The previous prime is 20225431679. The next prime is 20225431697. The reversal of 20225431688 is 88613452202.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (20225431679) and next prime (20225431697).

It can be written as a sum of positive squares in 2 ways, for example, as 18659013604 + 1566418084 = 136598^2 + 39578^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=100562.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 30972770 + ... + 30973422.

Almost surely, 2^20225431688 is an apocalyptic number.

20225431688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20225431688

20225431688 is an abundant number, since it is smaller than the sum of its proper divisors (28338037357).

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

20225431688 is an equidigital number, since it uses as much as digits as its factorization.

20225431688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 20225431688 in words is "twenty billion, two hundred twenty-five million, four hundred thirty-one thousand, six hundred eighty-eight".