20443155 has 16 divisors (see below), whose sum is σ = 32766720. Its totient is φ = 10883808.

The previous prime is 20443141. The next prime is 20443201. The reversal of 20443155 is 55134402.

It is not a de Polignac number, because 20443155 - 2⁵ = 20443123 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13044 + ... + 14526.

It is an arithmetic number, because the mean of its divisors is an integer number (2047920).

Almost surely, 2^20443155 is an apocalyptic number.

20443155 is a deficient number, since it is larger than the sum of its proper divisors (12323565).

20443155 is a wasteful number, since it uses less digits than its factorization.

20443155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20443155 is about 4521.4107311767. The cubic root of 20443155 is about 273.4319798940.

Adding to 20443155 its reverse (55134402), we get a palindrome (75577557).

The spelling of 20443155 in words is "twenty million, four hundred forty-three thousand, one hundred fifty-five".