20520137706 has 16 divisors (see below), whose sum is σ = 42364155648. Its totient is φ = 6619399200.

The previous prime is 20520137669. The next prime is 20520137713. The reversal of 20520137706 is 60773102502.

It is a super-3 number, since 3×20520137706³ (a number of 32 digits) contains 333 as substring.

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, 55161475 + ... + 55161846.

It is an arithmetic number, because the mean of its divisors is an integer number (2647759728).

Almost surely, 2^20520137706 is an apocalyptic number.

20520137706 is an abundant number, since it is smaller than the sum of its proper divisors (21844017942).

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

20520137706 is a wasteful number, since it uses less digits than its factorization.

20520137706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110323357.

The product of its (nonzero) digits is 17640, while the sum is 33.

The spelling of 20520137706 in words is "twenty billion, five hundred twenty million, one hundred thirty-seven thousand, seven hundred six".