20291670507688 has 8 divisors (see below), whose sum is σ = 38046882201930. Its totient is φ = 10145835253840.

The previous prime is 20291670507659. The next prime is 20291670507707. The reversal of 20291670507688 is 88670507619202.

It can be written as a sum of positive squares in only one way, i.e., 14210623011204 + 6081047496484 = 3769698^2 + 2465978^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1268229406723 + ... + 1268229406738.

Almost surely, 2^{20291670507688} is an apocalyptic number.

It is an amenable number.

20291670507688 is a deficient number, since it is larger than the sum of its proper divisors (17755211694242).

20291670507688 is a wasteful number, since it uses less digits than its factorization.

20291670507688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536458813467 (or 2536458813463 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 20291670507688 in words is "twenty trillion, two hundred ninety-one billion, six hundred seventy million, five hundred seven thousand, six hundred eighty-eight".