20690756 has 12 divisors (see below), whose sum is σ = 36276240. Its totient is φ = 10326120.

The previous prime is 20690737. The next prime is 20690767. The reversal of 20690756 is 65709602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2246 + ... + 6813.

It is an arithmetic number, because the mean of its divisors is an integer number (3023020).

Almost surely, 2^20690756 is an apocalyptic number.

It is an amenable number.

20690756 is a deficient number, since it is larger than the sum of its proper divisors (15585484).

20690756 is a wasteful number, since it uses less digits than its factorization.

20690756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9634 (or 9632 counting only the distinct ones).

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

The square root of 20690756 is about 4548.7092674736. The cubic root of 20690756 is about 274.5314600147.

The spelling of 20690756 in words is "twenty million, six hundred ninety thousand, seven hundred fifty-six".