20825668 has 6 divisors (see below), whose sum is σ = 36444926. Its totient is φ = 10412832.

The previous prime is 20825657. The next prime is 20825681. The reversal of 20825668 is 86652802.

It can be written as a sum of positive squares in only one way, i.e., 16793604 + 4032064 = 4098^2 + 2008^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2603205 + ... + 2603212.

Almost surely, 2^20825668 is an apocalyptic number.

It is an amenable number.

20825668 is a deficient number, since it is larger than the sum of its proper divisors (15619258).

20825668 is a wasteful number, since it uses less digits than its factorization.

20825668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5206421 (or 5206419 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 20825668 is about 4563.5148734282. The cubic root of 20825668 is about 275.1268527708.

It can be divided in two parts, 2082 and 5668, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 20825668 in words is "twenty million, eight hundred twenty-five thousand, six hundred sixty-eight".