20659407986 has 16 divisors (see below), whose sum is σ = 36373321536. Its totient is φ = 8614733616.

The previous prime is 20659407961. The next prime is 20659408001. The reversal of 20659407986 is 68970495602.

It is a happy number.

It is a super-2 number, since 2×20659407986² (a number of 21 digits) contains 22 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, 19940996 + ... + 19942031.

It is an arithmetic number, because the mean of its divisors is an integer number (2273332596).

Almost surely, 2^20659407986 is an apocalyptic number.

20659407986 is a deficient number, since it is larger than the sum of its proper divisors (15713913550).

20659407986 is a wasteful number, since it uses less digits than its factorization.

20659407986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39883073.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 20659407986 in words is "twenty billion, six hundred fifty-nine million, four hundred seven thousand, nine hundred eighty-six".