20690804 has 24 divisors (see below), whose sum is σ = 37830240. Its totient is φ = 9889376.

The previous prime is 20690797. The next prime is 20690827. The reversal of 20690804 is 40809602.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11579 + ... + 13245.

It is an arithmetic number, because the mean of its divisors is an integer number (1576260).

Almost surely, 2^20690804 is an apocalyptic number.

It is an amenable number.

20690804 is a deficient number, since it is larger than the sum of its proper divisors (17139436).

20690804 is a wasteful number, since it uses less digits than its factorization.

20690804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807 (or 1805 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20690804 is about 4548.7145436925. The cubic root of 20690804 is about 274.5316723076.

The spelling of 20690804 in words is "twenty million, six hundred ninety thousand, eight hundred four".