20255304690 has 40 divisors (see below), whose sum is σ = 54464265900. Its totient is φ = 5401414368.

The previous prime is 20255304617. The next prime is 20255304709. The reversal of 20255304690 is 9640355202.

It can be written as a sum of positive squares in 2 ways, for example, as 20121138801 + 134165889 = 141849^2 + 11583^2 .

It is a super-2 number, since 2×20255304690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12502465 + ... + 12504084.

Almost surely, 2^20255304690 is an apocalyptic number.

20255304690 is an abundant number, since it is smaller than the sum of its proper divisors (34208961210).

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

20255304690 is a wasteful number, since it uses less digits than its factorization.

20255304690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25006568 (or 25006559 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 20255304690 its reverse (9640355202), we get a palindrome (29895659892).

The spelling of 20255304690 in words is "twenty billion, two hundred fifty-five million, three hundred four thousand, six hundred ninety".