20858733506 has 32 divisors (see below), whose sum is σ = 34031935728. Its totient is φ = 9531002880.

The previous prime is 20858733503. The next prime is 20858733521. The reversal of 20858733506 is 60533785802.

It can be written as a sum of positive squares in 8 ways, for example, as 455182225 + 20403551281 = 21335^2 + 142841^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20858733503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2925626 + ... + 2932746.

Almost surely, 2^20858733506 is an apocalyptic number.

20858733506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20858733506 is a deficient number, since it is larger than the sum of its proper divisors (13173202222).

20858733506 is a wasteful number, since it uses less digits than its factorization.

20858733506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8246.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 20858733506 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-three thousand, five hundred six".