20661748 has 12 divisors (see below), whose sum is σ = 37324672. Its totient is φ = 9997560.

The previous prime is 20661727. The next prime is 20661763. The reversal of 20661748 is 84716602.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 83190 + ... + 83437.

Almost surely, 2^20661748 is an apocalyptic number.

It is an amenable number.

20661748 is a deficient number, since it is larger than the sum of its proper divisors (16662924).

20661748 is a wasteful number, since it uses less digits than its factorization.

20661748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166662 (or 166660 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20661748 is about 4545.5195522624. The cubic root of 20661748 is about 274.4031042553.

The spelling of 20661748 in words is "twenty million, six hundred sixty-one thousand, seven hundred forty-eight".