20551563004564 has 24 divisors (see below), whose sum is σ = 36940801701888. Its totient is φ = 9997101361440.

The previous prime is 20551563004559. The next prime is 20551563004607. The reversal of 20551563004564 is 46540036515502.

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, 5087332 + ... + 8184379.

It is an arithmetic number, because the mean of its divisors is an integer number (1539200070912).

Almost surely, 2^{20551563004564} is an apocalyptic number.

It is an amenable number.

20551563004564 is a deficient number, since it is larger than the sum of its proper divisors (16389238697324).

20551563004564 is a wasteful number, since it uses less digits than its factorization.

20551563004564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13282215 (or 13282213 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 46.

The spelling of 20551563004564 in words is "twenty trillion, five hundred fifty-one billion, five hundred sixty-three million, four thousand, five hundred sixty-four".