20229855 has 16 divisors (see below), whose sum is σ = 32667360. Its totient is φ = 10689408.

The previous prime is 20229841. The next prime is 20229863. The reversal of 20229855 is 55892202.

It is not a de Polignac number, because 20229855 - 2¹⁴ = 20213471 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4552 + ... + 7821.

It is an arithmetic number, because the mean of its divisors is an integer number (2041710).

Almost surely, 2^20229855 is an apocalyptic number.

20229855 is a deficient number, since it is larger than the sum of its proper divisors (12437505).

20229855 is a wasteful number, since it uses less digits than its factorization.

20229855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12490.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 20229855 is about 4497.7611097078. The cubic root of 20229855 is about 272.4776740119.

The spelling of 20229855 in words is "twenty million, two hundred twenty-nine thousand, eight hundred fifty-five".