20647308932760 has 128 divisors (see below), whose sum is σ = 65588196484800. Its totient is φ = 5181862133760.

The previous prime is 20647308932753. The next prime is 20647308932791. The reversal of 20647308932760 is 6723980374602.

It is a Cunningham number, because it is equal to 4543931²-1.

It is a super-2 number, since 2×20647308932760² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20647308932760.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54337830 + ... + 54716490.

Almost surely, 2^{20647308932760} is an apocalyptic number.

20647308932760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20647308932760 is an abundant number, since it is smaller than the sum of its proper divisors (44940887552040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20647308932760 is a wasteful number, since it uses less digits than its factorization.

20647308932760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405421 (or 405417 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 57.

The spelling of 20647308932760 in words is "twenty trillion, six hundred forty-seven billion, three hundred eight million, nine hundred thirty-two thousand, seven hundred sixty".