20385356885690 has 16 divisors (see below), whose sum is σ = 37056945786120. Its totient is φ = 8073408667200.

The previous prime is 20385356885659. The next prime is 20385356885737. The reversal of 20385356885690 is 9658865358302.

It can be written as a sum of positive squares in 4 ways, for example, as 17768846826721 + 2616510058969 = 4215311^2 + 1617563^2 .

It is a super-2 number, since 2×20385356885690² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20385356885690.

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, 10091759825 + ... + 10091761844.

Almost surely, 2^{20385356885690} is an apocalyptic number.

20385356885690 is a deficient number, since it is larger than the sum of its proper divisors (16671588900430).

20385356885690 is a wasteful number, since it uses less digits than its factorization.

20385356885690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20183521777.

The product of its (nonzero) digits is 373248000, while the sum is 68.

The spelling of 20385356885690 in words is "twenty trillion, three hundred eighty-five billion, three hundred fifty-six million, eight hundred eighty-five thousand, six hundred ninety".