20204690 has 32 divisors (see below), whose sum is σ = 40170816. Its totient is φ = 7255360.

The previous prime is 20204671. The next prime is 20204707. The reversal of 20204690 is 9640202.

It is a super-2 number, since 2×20204690² = 816458995992200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8024 + ... + 10236.

It is an arithmetic number, because the mean of its divisors is an integer number (1255338).

Almost surely, 2^20204690 is an apocalyptic number.

20204690 is a deficient number, since it is larger than the sum of its proper divisors (19966126).

20204690 is a wasteful number, since it uses less digits than its factorization.

20204690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20204690 is about 4494.9627362193. The cubic root of 20204690 is about 272.3646439406.

Adding to 20204690 its reverse (9640202), we get a palindrome (29844892).

The spelling of 20204690 in words is "twenty million, two hundred four thousand, six hundred ninety".