20238855 has 32 divisors (see below), whose sum is σ = 39857664. Its totient is φ = 8539776.

The previous prime is 20238851. The next prime is 20238887. The reversal of 20238855 is 55883202.

It is not a de Polignac number, because 20238855 - 2² = 20238851 is a prime.

It is a super-2 number, since 2×20238855² = 819222503422050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20238851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6049 + ... + 8778.

It is an arithmetic number, because the mean of its divisors is an integer number (1245552).

Almost surely, 2^20238855 is an apocalyptic number.

20238855 is a deficient number, since it is larger than the sum of its proper divisors (19618809).

20238855 is a wasteful number, since it uses less digits than its factorization.

20238855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14855.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 20238855 is about 4498.7614962343. The cubic root of 20238855 is about 272.5180752817.

It can be divided in two parts, 2023 and 8855, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 20238855 in words is "twenty million, two hundred thirty-eight thousand, eight hundred fifty-five".