20893918685 has 16 divisors (see below), whose sum is σ = 26186803200. Its totient is φ = 15987715776.

The previous prime is 20893918679. The next prime is 20893918699. The reversal of 20893918685 is 58681939802.

It is a cyclic number.

It is not a de Polignac number, because 20893918685 - 2¹⁸ = 20893656541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a congruent number.

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, 946205 + ... + 968034.

It is an arithmetic number, because the mean of its divisors is an integer number (1636675200).

Almost surely, 2^20893918685 is an apocalyptic number.

It is an amenable number.

20893918685 is a deficient number, since it is larger than the sum of its proper divisors (5292884515).

20893918685 is a wasteful number, since it uses less digits than its factorization.

20893918685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914340.

The product of its (nonzero) digits is 7464960, while the sum is 59.

The spelling of 20893918685 in words is "twenty billion, eight hundred ninety-three million, nine hundred eighteen thousand, six hundred eighty-five".