20650521506 has 16 divisors (see below), whose sum is σ = 31661663616. Its totient is φ = 10097006256.

The previous prime is 20650521497. The next prime is 20650521557. The reversal of 20650521506 is 60512505602.

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, 19040 + ... + 204116.

It is an arithmetic number, because the mean of its divisors is an integer number (1978853976).

Almost surely, 2^20650521506 is an apocalyptic number.

20650521506 is a deficient number, since it is larger than the sum of its proper divisors (11011142110).

20650521506 is a wasteful number, since it uses less digits than its factorization.

20650521506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186313.

The product of its (nonzero) digits is 18000, while the sum is 32.

The spelling of 20650521506 in words is "twenty billion, six hundred fifty million, five hundred twenty-one thousand, five hundred six".