20657066 has 8 divisors (see below), whose sum is σ = 32616480. Its totient is φ = 9784908.

The previous prime is 20657053. The next prime is 20657069. The reversal of 20657066 is 66075602.

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

It is not an unprimeable number, because it can be changed into a prime (20657069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271766 + ... + 271841.

It is an arithmetic number, because the mean of its divisors is an integer number (4077060).

Almost surely, 2^20657066 is an apocalyptic number.

20657066 is a deficient number, since it is larger than the sum of its proper divisors (11959414).

20657066 is a wasteful number, since it uses less digits than its factorization.

20657066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543628.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20657066 is about 4545.0045104488. The cubic root of 20657066 is about 274.3823758963.

The spelling of 20657066 in words is "twenty million, six hundred fifty-seven thousand, sixty-six".