20689570854 has 32 divisors (see below), whose sum is σ = 46530771840. Its totient is φ = 6813431496.

The previous prime is 20689570823. The next prime is 20689570861. The reversal of 20689570854 is 45807598602.

20689570854 is a `hidden beast` number, since 2 + 0 + 68 + 9 + 570 + 8 + 5 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 20689570854.

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, 2303592 + ... + 2312555.

It is an arithmetic number, because the mean of its divisors is an integer number (1454086620).

Almost surely, 2^20689570854 is an apocalyptic number.

20689570854 is an abundant number, since it is smaller than the sum of its proper divisors (25841200986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20689570854 is a wasteful number, since it uses less digits than its factorization.

20689570854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4616241 (or 4616235 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 20689570854 in words is "twenty billion, six hundred eighty-nine million, five hundred seventy thousand, eight hundred fifty-four".