20690755 has 8 divisors (see below), whose sum is σ = 25169472. Its totient is φ = 16325568.

The previous prime is 20690737. The next prime is 20690767. The reversal of 20690755 is 55709602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20690755 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20690755.

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, 27979 + ... + 28708.

It is an arithmetic number, because the mean of its divisors is an integer number (3146184).

Almost surely, 2^20690755 is an apocalyptic number.

20690755 is a deficient number, since it is larger than the sum of its proper divisors (4478717).

20690755 is an equidigital number, since it uses as much as digits as its factorization.

20690755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56765.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 20690755 is about 4548.7091575523. The cubic root of 20690755 is about 274.5314555920.

The spelling of 20690755 in words is "twenty million, six hundred ninety thousand, seven hundred fifty-five".