20892389864 has 16 divisors (see below), whose sum is σ = 39187839300. Its totient is φ = 10442299392.

The previous prime is 20892389789. The next prime is 20892389899. The reversal of 20892389864 is 46898329802.

It can be written as a sum of positive squares in 2 ways, for example, as 20892389764 + 100 = 144542^2 + 10^2 .

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, 464087 + ... + 507110.

Almost surely, 2^20892389864 is an apocalyptic number.

It is an amenable number.

20892389864 is a deficient number, since it is larger than the sum of its proper divisors (18295449436).

20892389864 is a wasteful number, since it uses less digits than its factorization.

20892389864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973892 (or 973888 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 59.

The spelling of 20892389864 in words is "twenty billion, eight hundred ninety-two million, three hundred eighty-nine thousand, eight hundred sixty-four".