20013233556 has 24 divisors (see below), whose sum is σ = 47463080224. Its totient is φ = 6561715680.

The previous prime is 20013233533. The next prime is 20013233573. The reversal of 20013233556 is 65533231002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13669510 + ... + 13670973.

Almost surely, 2^20013233556 is an apocalyptic number.

It is an amenable number.

20013233556 is an abundant number, since it is smaller than the sum of its proper divisors (27449846668).

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

20013233556 is a wasteful number, since it uses less digits than its factorization.

20013233556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27340551 (or 27340549 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 20013233556 its reverse (65533231002), we get a palindrome (85546464558).

The spelling of 20013233556 in words is "twenty billion, thirteen million, two hundred thirty-three thousand, five hundred fifty-six".