20351851684 has 6 divisors (see below), whose sum is σ = 35615740454. Its totient is φ = 10175925840.

The previous prime is 20351851673. The next prime is 20351851717. The reversal of 20351851684 is 48615815302.

It can be written as a sum of positive squares in only one way, i.e., 19476993600 + 874858084 = 139560^2 + 29578^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20351851684.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2543981457 + ... + 2543981464.

Almost surely, 2^20351851684 is an apocalyptic number.

It is an amenable number.

20351851684 is a deficient number, since it is larger than the sum of its proper divisors (15263888770).

20351851684 is a wasteful number, since it uses less digits than its factorization.

20351851684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5087962925 (or 5087962923 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 20351851684 in words is "twenty billion, three hundred fifty-one million, eight hundred fifty-one thousand, six hundred eighty-four".