20554155 has 28 divisors (see below), whose sum is σ = 36987120. Its totient is φ = 10960272.

The previous prime is 20554153. The next prime is 20554159. The reversal of 20554155 is 55145502.

It is not a de Polignac number, because 20554155 - 2¹ = 20554153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20554151) by changing a digit.

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 27 ways as a sum of consecutive naturals, for example, 826 + ... + 6464.

Almost surely, 2^20554155 is an apocalyptic number.

20554155 is a deficient number, since it is larger than the sum of its proper divisors (16432965).

20554155 is an frugal number, since it uses more digits than its factorization.

20554155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5662 (or 5647 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 20554155 is about 4533.6690439422. The cubic root of 20554155 is about 273.9259705523.

Adding to 20554155 its reverse (55145502), we get a palindrome (75699657).

The spelling of 20554155 in words is "twenty million, five hundred fifty-four thousand, one hundred fifty-five".