20668748 has 6 divisors (see below), whose sum is σ = 36170316. Its totient is φ = 10334372.

The previous prime is 20668733. The next prime is 20668759. The reversal of 20668748 is 84786602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583590 + ... + 2583597.

It is an arithmetic number, because the mean of its divisors is an integer number (6028386).

Almost surely, 2^20668748 is an apocalyptic number.

It is an amenable number.

20668748 is a deficient number, since it is larger than the sum of its proper divisors (15501568).

20668748 is a wasteful number, since it uses less digits than its factorization.

20668748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5167191 (or 5167189 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 20668748 is about 4546.2894760453. The cubic root of 20668748 is about 274.4340891273.

The spelling of 20668748 in words is "twenty million, six hundred sixty-eight thousand, seven hundred forty-eight".