20189769786 has 12 divisors (see below), whose sum is σ = 43744501242. Its totient is φ = 6729923256.

The previous prime is 20189769779. The next prime is 20189769793. The reversal of 20189769786 is 68796798102.

It is an interprime number because it is at equal distance from previous prime (20189769779) and next prime (20189769793).

It can be written as a sum of positive squares in only one way, i.e., 20122841025 + 66928761 = 141855^2 + 8181^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560826921 + ... + 560826956.

Almost surely, 2^20189769786 is an apocalyptic number.

20189769786 is an abundant number, since it is smaller than the sum of its proper divisors (23554731456).

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

20189769786 is a wasteful number, since it uses less digits than its factorization.

20189769786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121653885 (or 1121653882 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 20189769786 in words is "twenty billion, one hundred eighty-nine million, seven hundred sixty-nine thousand, seven hundred eighty-six".