20660645 has 8 divisors (see below), whose sum is σ = 25142400. Its totient is φ = 16295440.

The previous prime is 20660621. The next prime is 20660659. The reversal of 20660645 is 54606602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20660645 - 2¹⁸ = 20398501 is a prime.

It is a congruent number.

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, 28745 + ... + 29454.

It is an arithmetic number, because the mean of its divisors is an integer number (3142800).

Almost surely, 2^20660645 is an apocalyptic number.

It is an amenable number.

20660645 is a deficient number, since it is larger than the sum of its proper divisors (4481755).

20660645 is an equidigital number, since it uses as much as digits as its factorization.

20660645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58275.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20660645 is about 4545.3982223783. The cubic root of 20660645 is about 274.3982212866.

The spelling of 20660645 in words is "twenty million, six hundred sixty thousand, six hundred forty-five".