20659621916 has 12 divisors (see below), whose sum is σ = 36155363832. Its totient is φ = 10329517968.

The previous prime is 20659621891. The next prime is 20659621933. The reversal of 20659621916 is 61912695602.

It is a super-2 number, since 2×20659621916² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192671 + ... + 280073.

It is an arithmetic number, because the mean of its divisors is an integer number (3012946986).

Almost surely, 2^20659621916 is an apocalyptic number.

It is an amenable number.

20659621916 is a deficient number, since it is larger than the sum of its proper divisors (15495741916).

20659621916 is a wasteful number, since it uses less digits than its factorization.

20659621916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146500 (or 146498 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 20659621916 in words is "twenty billion, six hundred fifty-nine million, six hundred twenty-one thousand, nine hundred sixteen".