20690474 has 32 divisors (see below), whose sum is σ = 37100160. Its totient is φ = 8468928.

The previous prime is 20690447. The next prime is 20690477. The reversal of 20690474 is 47409602.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20690474.

It is not an unprimeable number, because it can be changed into a prime (20690477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30224 + ... + 30900.

It is an arithmetic number, because the mean of its divisors is an integer number (1159380).

Almost surely, 2^20690474 is an apocalyptic number.

20690474 is a deficient number, since it is larger than the sum of its proper divisors (16409686).

20690474 is a wasteful number, since it uses less digits than its factorization.

20690474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20690474 is about 4548.6782695636. The cubic root of 20690474 is about 274.5302127875.

The spelling of 20690474 in words is "twenty million, six hundred ninety thousand, four hundred seventy-four".