19802164 has 6 divisors (see below), whose sum is σ = 34653794. Its totient is φ = 9901080.

The previous prime is 19802137. The next prime is 19802171. The reversal of 19802164 is 46120891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18992164 + 810000 = 4358^2 + 900^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2475267 + ... + 2475274.

Almost surely, 2^19802164 is an apocalyptic number.

It is an amenable number.

19802164 is a deficient number, since it is larger than the sum of its proper divisors (14851630).

19802164 is a wasteful number, since it uses less digits than its factorization.

19802164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4950545 (or 4950543 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 19802164 is about 4449.9622470309. The cubic root of 19802164 is about 270.5437783555.

The spelling of 19802164 in words is "nineteen million, eight hundred two thousand, one hundred sixty-four".