20055553 has 10 divisors (see below), whose sum is σ = 23399554. Its totient is φ = 17188416.

The previous prime is 20055547. The next prime is 20055569. The reversal of 20055553 is 35555002.

It can be written as a sum of positive squares in only one way, i.e., 18173169 + 1882384 = 4263^2 + 1372^2 .

It is not a de Polignac number, because 20055553 - 2¹³ = 20047361 is a prime.

It is a super-2 number, since 2×20055553² = 804450412271618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20055593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1776 + ... + 6577.

Almost surely, 2^20055553 is an apocalyptic number.

It is an amenable number.

20055553 is a deficient number, since it is larger than the sum of its proper divisors (3344001).

20055553 is an frugal number, since it uses more digits than its factorization.

20055553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8381 (or 8360 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 25.

The square root of 20055553 is about 4478.3426621910. The cubic root of 20055553 is about 271.6928527249.

The spelling of 20055553 in words is "twenty million, fifty-five thousand, five hundred fifty-three".