20820755 has 8 divisors (see below), whose sum is σ = 25021872. Its totient is φ = 16631968.

The previous prime is 20820731. The next prime is 20820757. The reversal of 20820755 is 55702802.

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

It is a cyclic number.

It is not a de Polignac number, because 20820755 - 2⁶ = 20820691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20820757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1172 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (3127734).

Almost surely, 2^20820755 is an apocalyptic number.

20820755 is a deficient number, since it is larger than the sum of its proper divisors (4201117).

20820755 is an equidigital number, since it uses as much as digits as its factorization.

20820755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6165.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 20820755 is about 4562.9765504548. The cubic root of 20820755 is about 275.1052159372.

The spelling of 20820755 in words is "twenty million, eight hundred twenty thousand, seven hundred fifty-five".