20513311821057 has 8 divisors (see below), whose sum is σ = 29837544467040. Its totient is φ = 12432310194560.

The previous prime is 20513311821049. The next prime is 20513311821059. The reversal of 20513311821057 is 75012811331502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20513311821057 - 2³ = 20513311821049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20513311821059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310807754832 + ... + 310807754897.

It is an arithmetic number, because the mean of its divisors is an integer number (3729693058380).

Almost surely, 2^{20513311821057} is an apocalyptic number.

It is an amenable number.

20513311821057 is a deficient number, since it is larger than the sum of its proper divisors (9324232645983).

20513311821057 is a wasteful number, since it uses less digits than its factorization.

20513311821057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621615509743.

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 20513311821057 in words is "twenty trillion, five hundred thirteen billion, three hundred eleven million, eight hundred twenty-one thousand, fifty-seven".