20689075 has 24 divisors (see below), whose sum is σ = 29212416. Its totient is φ = 14388000.

The previous prime is 20689061. The next prime is 20689087. The reversal of 20689075 is 57098602.

It is not a de Polignac number, because 20689075 - 2⁷ = 20688947 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4690 + ... + 7960.

It is an arithmetic number, because the mean of its divisors is an integer number (1217184).

Almost surely, 2^20689075 is an apocalyptic number.

20689075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20689075 is a deficient number, since it is larger than the sum of its proper divisors (8523341).

20689075 is a wasteful number, since it uses less digits than its factorization.

20689075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315 (or 3310 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 20689075 is about 4548.5244860284. The cubic root of 20689075 is about 274.5240251344.

The spelling of 20689075 in words is "twenty million, six hundred eighty-nine thousand, seventy-five".