20404276 has 12 divisors (see below), whose sum is σ = 35862372. Its totient is φ = 10157888.

The previous prime is 20404261. The next prime is 20404331. The reversal of 20404276 is 67240402.

It can be written as a sum of positive squares in 2 ways, for example, as 9672100 + 10732176 = 3110^2 + 3276^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20404276.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10015 + ... + 11878.

It is an arithmetic number, because the mean of its divisors is an integer number (2988531).

Almost surely, 2^20404276 is an apocalyptic number.

It is an amenable number.

20404276 is a deficient number, since it is larger than the sum of its proper divisors (15458096).

20404276 is a wasteful number, since it uses less digits than its factorization.

20404276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22130 (or 22128 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20404276 is about 4517.1092526084. The cubic root of 20404276 is about 273.2585313191.

Adding to 20404276 its reverse (67240402), we get a palindrome (87644678).

The spelling of 20404276 in words is "twenty million, four hundred four thousand, two hundred seventy-six".