20668870 has 8 divisors (see below), whose sum is σ = 37203984. Its totient is φ = 8267544.

The previous prime is 20668867. The next prime is 20668871. The reversal of 20668870 is 7886602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1033434 + ... + 1033453.

It is an arithmetic number, because the mean of its divisors is an integer number (4650498).

Almost surely, 2^20668870 is an apocalyptic number.

20668870 is a deficient number, since it is larger than the sum of its proper divisors (16535114).

20668870 is a wasteful number, since it uses less digits than its factorization.

20668870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066894.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 20668870 is about 4546.3028935609. The cubic root of 20668870 is about 274.4346290874.

The spelling of 20668870 in words is "twenty million, six hundred sixty-eight thousand, eight hundred seventy".