20115668 has 6 divisors (see below), whose sum is σ = 35202426. Its totient is φ = 10057832.

The previous prime is 20115659. The next prime is 20115713. The reversal of 20115668 is 86651102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 2155024 = 4238^2 + 1468^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20115668.

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, 2514455 + ... + 2514462.

It is an arithmetic number, because the mean of its divisors is an integer number (5867071).

Almost surely, 2^20115668 is an apocalyptic number.

It is an amenable number.

20115668 is a deficient number, since it is larger than the sum of its proper divisors (15086758).

20115668 is a wasteful number, since it uses less digits than its factorization.

20115668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028921 (or 5028919 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20115668 is about 4485.0493865731. The cubic root of 20115668 is about 271.9640415268.

The spelling of 20115668 in words is "twenty million, one hundred fifteen thousand, six hundred sixty-eight".