20017959802 has 16 divisors (see below), whose sum is σ = 30804824232. Its totient is φ = 9750407680.

The previous prime is 20017959791. The next prime is 20017959821. The reversal of 20017959802 is 20895971002.

It can be written as a sum of positive squares in 4 ways, for example, as 15321735961 + 4696223841 = 123781^2 + 68529^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124783 + ... + 235810.

Almost surely, 2^20017959802 is an apocalyptic number.

20017959802 is a deficient number, since it is larger than the sum of its proper divisors (10786864430).

20017959802 is a wasteful number, since it uses less digits than its factorization.

20017959802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361313.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 20017959802 in words is "twenty billion, seventeen million, nine hundred fifty-nine thousand, eight hundred two".