20645854602 has 16 divisors (see below), whose sum is σ = 41700539232. Its totient is φ = 6813813200.

The previous prime is 20645854571. The next prime is 20645854633.

It is a happy number.

20645854602 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (20645854571) and next prime (20645854633).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17033928 + ... + 17035139.

It is an arithmetic number, because the mean of its divisors is an integer number (2606283702).

Almost surely, 2^20645854602 is an apocalyptic number.

20645854602 is an abundant number, since it is smaller than the sum of its proper divisors (21054684630).

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

20645854602 is a wasteful number, since it uses less digits than its factorization.

20645854602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34069173.

The product of its (nonzero) digits is 460800, while the sum is 42.

The spelling of 20645854602 in words is "twenty billion, six hundred forty-five million, eight hundred fifty-four thousand, six hundred two".