20643412 has 12 divisors (see below), whose sum is σ = 36326836. Its totient is φ = 10264320.

The previous prime is 20643407. The next prime is 20643421. The reversal of 20643412 is 21434602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9326916 + 11316496 = 3054^2 + 3364^2 .

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, 13533 + ... + 14980.

Almost surely, 2^20643412 is an apocalyptic number.

It is an amenable number.

20643412 is a deficient number, since it is larger than the sum of its proper divisors (15683424).

20643412 is a wasteful number, since it uses less digits than its factorization.

20643412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28698 (or 28696 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20643412 is about 4543.5021734341. The cubic root of 20643412 is about 274.3219084078.

It can be divided in two parts, 2064 and 3412, that added together give a square (5476 = 74²).

The spelling of 20643412 in words is "twenty million, six hundred forty-three thousand, four hundred twelve".