20935890409834 has 32 divisors (see below), whose sum is σ = 32281048858320. Its totient is φ = 10179464486400.

The previous prime is 20935890409813. The next prime is 20935890409969. The reversal of 20935890409834 is 43890409853902.

It can be written as a sum of positive squares in 8 ways, for example, as 8477793072225 + 12458097337609 = 2911665^2 + 3529603^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96973552 + ... + 97189204.

Almost surely, 2^{20935890409834} is an apocalyptic number.

20935890409834 is a deficient number, since it is larger than the sum of its proper divisors (11345158448486).

20935890409834 is a wasteful number, since it uses less digits than its factorization.

20935890409834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224746.

The product of its (nonzero) digits is 67184640, while the sum is 64.

The spelling of 20935890409834 in words is "twenty trillion, nine hundred thirty-five billion, eight hundred ninety million, four hundred nine thousand, eight hundred thirty-four".