20689851252 has 24 divisors (see below), whose sum is σ = 55172936896. Its totient is φ = 5911386048.

The previous prime is 20689851251. The next prime is 20689851257. The reversal of 20689851252 is 25215898602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689851251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123153793 + ... + 123153960.

Almost surely, 2^20689851252 is an apocalyptic number.

It is an amenable number.

20689851252 is an abundant number, since it is smaller than the sum of its proper divisors (34483085644).

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

20689851252 is a wasteful number, since it uses less digits than its factorization.

20689851252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246307767 (or 246307765 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 20689851252 in words is "twenty billion, six hundred eighty-nine million, eight hundred fifty-one thousand, two hundred fifty-two".