20811859104494 has 8 divisors (see below), whose sum is σ = 31220836406760. Its totient is φ = 10404913635576.

The previous prime is 20811859104479. The next prime is 20811859104503. The reversal of 20811859104494 is 49440195811802.

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

It is a super-2 number, since 2×20811859104494² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507932729 + ... + 507973700.

It is an arithmetic number, because the mean of its divisors is an integer number (3902604550845).

Almost surely, 2^{20811859104494} is an apocalyptic number.

20811859104494 is a deficient number, since it is larger than the sum of its proper divisors (10408977302266).

20811859104494 is a wasteful number, since it uses less digits than its factorization.

20811859104494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015916674.

The product of its (nonzero) digits is 3317760, while the sum is 56.

The spelling of 20811859104494 in words is "twenty trillion, eight hundred eleven billion, eight hundred fifty-nine million, one hundred four thousand, four hundred ninety-four".