20623855 has 12 divisors (see below), whose sum is σ = 28789560. Its totient is φ = 14141904.

The previous prime is 20623853. The next prime is 20623859. The reversal of 20623855 is 55832602.

It is a happy number.

It is not a de Polignac number, because 20623855 - 2¹ = 20623853 is a prime.

It is a super-2 number, since 2×20623855² = 850686790122050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20623853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41845 + ... + 42334.

It is an arithmetic number, because the mean of its divisors is an integer number (2399130).

Almost surely, 2^20623855 is an apocalyptic number.

20623855 is a deficient number, since it is larger than the sum of its proper divisors (8165705).

20623855 is an equidigital number, since it uses as much as digits as its factorization.

20623855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84198 (or 84191 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20623855 is about 4541.3494690455. The cubic root of 20623855 is about 274.2352526966.

The spelling of 20623855 in words is "twenty million, six hundred twenty-three thousand, eight hundred fifty-five".