20523139556 has 24 divisors (see below), whose sum is σ = 36340920000. Its totient is φ = 10140518304.

The previous prime is 20523139547. The next prime is 20523139573. The reversal of 20523139556 is 65593132502.

It is a happy 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, 103145 + ... + 227343.

It is an arithmetic number, because the mean of its divisors is an integer number (1514205000).

Almost surely, 2^20523139556 is an apocalyptic number.

It is an amenable number.

20523139556 is a deficient number, since it is larger than the sum of its proper divisors (15817780444).

20523139556 is a wasteful number, since it uses less digits than its factorization.

20523139556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124691 (or 124689 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 41.

The spelling of 20523139556 in words is "twenty billion, five hundred twenty-three million, one hundred thirty-nine thousand, five hundred fifty-six".