20905250684 has 6 divisors (see below), whose sum is σ = 36584188704. Its totient is φ = 10452625340.

The previous prime is 20905250633. The next prime is 20905250687. The reversal of 20905250684 is 48605250902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20905250687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2613156332 + ... + 2613156339.

It is an arithmetic number, because the mean of its divisors is an integer number (6097364784).

Almost surely, 2^20905250684 is an apocalyptic number.

It is an amenable number.

20905250684 is a deficient number, since it is larger than the sum of its proper divisors (15678938020).

20905250684 is a wasteful number, since it uses less digits than its factorization.

20905250684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5226312675 (or 5226312673 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 20905250684 in words is "twenty billion, nine hundred five million, two hundred fifty thousand, six hundred eighty-four".