20948666 has 4 divisors (see below), whose sum is σ = 31423002. Its totient is φ = 10474332.

The previous prime is 20948657. The next prime is 20948671. The reversal of 20948666 is 66684902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16200625 + 4748041 = 4025^2 + 2179^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5237165 + ... + 5237168.

Almost surely, 2^20948666 is an apocalyptic number.

20948666 is a deficient number, since it is larger than the sum of its proper divisors (10474336).

20948666 is a wasteful number, since it uses less digits than its factorization.

20948666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10474335.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 20948666 is about 4576.9712693003. The cubic root of 20948666 is about 275.6674300641.

The spelling of 20948666 in words is "twenty million, nine hundred forty-eight thousand, six hundred sixty-six".