20689674 has 16 divisors (see below), whose sum is σ = 41485440. Its totient is φ = 6878880.

The previous prime is 20689661. The next prime is 20689699. The reversal of 20689674 is 47698602.

It is a super-2 number, since 2×20689674² = 856125220452552, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1762 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (2592840).

Almost surely, 2^20689674 is an apocalyptic number.

20689674 is an abundant number, since it is smaller than the sum of its proper divisors (20795766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20689674 is a wasteful number, since it uses less digits than its factorization.

20689674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8845.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20689674 is about 4548.5903310806. The cubic root of 20689674 is about 274.5266744925.

The spelling of 20689674 in words is "twenty million, six hundred eighty-nine thousand, six hundred seventy-four".