20368690 has 8 divisors (see below), whose sum is σ = 36663660. Its totient is φ = 8147472.

The previous prime is 20368661. The next prime is 20368723. The reversal of 20368690 is 9686302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20367169 + 1521 = 4513^2 + 39^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20368690² = 829767064632200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1018425 + ... + 1018444.

Almost surely, 2^20368690 is an apocalyptic number.

20368690 is a deficient number, since it is larger than the sum of its proper divisors (16294970).

20368690 is a wasteful number, since it uses less digits than its factorization.

20368690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036876.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20368690 is about 4513.1685100382. The cubic root of 20368690 is about 273.0995803763.

The spelling of 20368690 in words is "twenty million, three hundred sixty-eight thousand, six hundred ninety".