20720371606 has 64 divisors (see below), whose sum is σ = 37308211200. Its totient is φ = 8519623200.

The previous prime is 20720371561. The next prime is 20720371643. The reversal of 20720371606 is 60617302702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6641715 + ... + 6644833.

It is an arithmetic number, because the mean of its divisors is an integer number (582940800).

Almost surely, 2^20720371606 is an apocalyptic number.

20720371606 is a deficient number, since it is larger than the sum of its proper divisors (16587839594).

20720371606 is a wasteful number, since it uses less digits than its factorization.

20720371606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865.

The product of its (nonzero) digits is 21168, while the sum is 34.

The spelling of 20720371606 in words is "twenty billion, seven hundred twenty million, three hundred seventy-one thousand, six hundred six".