20663394 has 16 divisors (see below), whose sum is σ = 41395968. Its totient is φ = 6876272.

The previous prime is 20663371. The next prime is 20663413. The reversal of 20663394 is 49336602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1519 + ... + 6605.

It is an arithmetic number, because the mean of its divisors is an integer number (2587248).

Almost surely, 2^20663394 is an apocalyptic number.

20663394 is an abundant number, since it is smaller than the sum of its proper divisors (20732574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20663394 is a wasteful number, since it uses less digits than its factorization.

20663394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5769.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 20663394 is about 4545.7006060672. The cubic root of 20663394 is about 274.4103907559.

Adding to 20663394 its reverse (49336602), we get a palindrome (69999996).

It can be divided in two parts, 2066 and 3394, that added together give a triangular number (5460 = T₁₀₄).

The spelling of 20663394 in words is "twenty million, six hundred sixty-three thousand, three hundred ninety-four".