20647308932705 has 64 divisors (see below), whose sum is σ = 30613536565248. Its totient is φ = 13018065361920.

The previous prime is 20647308932693. The next prime is 20647308932753. The reversal of 20647308932705 is 50723980374602.

It is not a de Polignac number, because 20647308932705 - 2³⁶ = 20578589455969 is a prime.

It is a super-2 number, since 2×20647308932705² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 685190819 + ... + 685220951.

It is an arithmetic number, because the mean of its divisors is an integer number (478336508832).

Almost surely, 2^{20647308932705} is an apocalyptic number.

It is an amenable number.

20647308932705 is a deficient number, since it is larger than the sum of its proper divisors (9966227632543).

20647308932705 is a wasteful number, since it uses less digits than its factorization.

20647308932705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35986.

The product of its (nonzero) digits is 15240960, while the sum is 56.

Adding to 20647308932705 its sum of digits (56), we get a square (20647308932761 = 4543931²).

The spelling of 20647308932705 in words is "twenty trillion, six hundred forty-seven billion, three hundred eight million, nine hundred thirty-two thousand, seven hundred five".