20623255 has 4 divisors (see below), whose sum is σ = 24747912. Its totient is φ = 16498600.

The previous prime is 20623247. The next prime is 20623283. The reversal of 20623255 is 55232602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20623255 - 2³ = 20623247 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 2062321 + ... + 2062330.

It is an arithmetic number, because the mean of its divisors is an integer number (6186978).

Almost surely, 2^20623255 is an apocalyptic number.

20623255 is a deficient number, since it is larger than the sum of its proper divisors (4124657).

20623255 is an equidigital number, since it uses as much as digits as its factorization.

20623255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124656.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20623255 is about 4541.2834089055. The cubic root of 20623255 is about 274.2325932722.

Adding to 20623255 its reverse (55232602), we get a palindrome (75855857).

The spelling of 20623255 in words is "twenty million, six hundred twenty-three thousand, two hundred fifty-five".