20651515156 has 24 divisors (see below), whose sum is σ = 36552466944. Its totient is φ = 10208617920.

The previous prime is 20651515121. The next prime is 20651515217. The reversal of 20651515156 is 65151515602.

It is a congruent number.

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, 41616 + ... + 207448.

It is an arithmetic number, because the mean of its divisors is an integer number (1523019456).

Almost surely, 2^20651515156 is an apocalyptic number.

It is an amenable number.

20651515156 is a deficient number, since it is larger than the sum of its proper divisors (15900951788).

20651515156 is a wasteful number, since it uses less digits than its factorization.

20651515156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166191 (or 166189 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 20651515156 in words is "twenty billion, six hundred fifty-one million, five hundred fifteen thousand, one hundred fifty-six".