20669750 has 32 divisors (see below), whose sum is σ = 40042080. Its totient is φ = 7980000.

The previous prime is 20669729. The next prime is 20669767. The reversal of 20669750 is 5796602.

It is a self number, because there is not a number n which added to its sum of digits gives 20669750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5825 + ... + 8675.

It is an arithmetic number, because the mean of its divisors is an integer number (1251315).

Almost surely, 2^20669750 is an apocalyptic number.

20669750 is a deficient number, since it is larger than the sum of its proper divisors (19372330).

20669750 is a wasteful number, since it uses less digits than its factorization.

20669750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897 (or 2887 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 20669750 is about 4546.3996744677. The cubic root of 20669750 is about 274.4385238180.

The spelling of 20669750 in words is "twenty million, six hundred sixty-nine thousand, seven hundred fifty".