20225431689 has 16 divisors (see below), whose sum is σ = 27143246400. Its totient is φ = 13395684096.

The previous prime is 20225431679. The next prime is 20225431697. The reversal of 20225431689 is 98613452202.

It is a de Polignac number, because none of the positive numbers 2^k-20225431689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20225431689.

It is not an unprimeable number, because it can be changed into a prime (20225431679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1562757 + ... + 1575645.

It is an arithmetic number, because the mean of its divisors is an integer number (1696452900).

Almost surely, 2^20225431689 is an apocalyptic number.

It is an amenable number.

20225431689 is a deficient number, since it is larger than the sum of its proper divisors (6917814711).

20225431689 is a wasteful number, since it uses less digits than its factorization.

20225431689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16264.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 20225431689 in words is "twenty billion, two hundred twenty-five million, four hundred thirty-one thousand, six hundred eighty-nine".