20520166544650 has 24 divisors (see below), whose sum is σ = 38172716771904. Its totient is φ = 8206946833200.

The previous prime is 20520166544639. The next prime is 20520166544653. The reversal of 20520166544650 is 5644566102502.

It is a self number, because there is not a number n which added to its sum of digits gives 20520166544650.

It is not an unprimeable number, because it can be changed into a prime (20520166544653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27624402 + ... + 28357501.

It is an arithmetic number, because the mean of its divisors is an integer number (1590529865496).

Almost surely, 2^{20520166544650} is an apocalyptic number.

20520166544650 is a deficient number, since it is larger than the sum of its proper divisors (17652550227254).

20520166544650 is a wasteful number, since it uses less digits than its factorization.

20520166544650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55989246 (or 55989241 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 20520166544650 in words is "twenty trillion, five hundred twenty billion, one hundred sixty-six million, five hundred forty-four thousand, six hundred fifty".