20557631550411 has 24 divisors (see below), whose sum is σ = 30419584125840. Its totient is φ = 13370388768000.

The previous prime is 20557631550377. The next prime is 20557631550419. The reversal of 20557631550411 is 11405513675502.

20557631550411 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 7 + 631 + 5 + 5 + 0 + 4 + 1 + 1 = 666.

It is not a de Polignac number, because 20557631550411 - 2¹⁸ = 20557631288267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20557631550419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10845936 + ... + 12599586.

It is an arithmetic number, because the mean of its divisors is an integer number (1267482671910).

Almost surely, 2^{20557631550411} is an apocalyptic number.

20557631550411 is a deficient number, since it is larger than the sum of its proper divisors (9861952575429).

20557631550411 is a wasteful number, since it uses less digits than its factorization.

20557631550411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785467 (or 1785464 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 45.

The spelling of 20557631550411 in words is "twenty trillion, five hundred fifty-seven billion, six hundred thirty-one million, five hundred fifty thousand, four hundred eleven".