20552403 has 8 divisors (see below), whose sum is σ = 27750400. Its totient is φ = 13528008.

The previous prime is 20552359. The next prime is 20552417. The reversal of 20552403 is 30425502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20552403 - 2⁶ = 20552339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20552403.

It is not an unprimeable number, because it can be changed into a prime (20552423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43123 + ... + 43596.

It is an arithmetic number, because the mean of its divisors is an integer number (3468800).

Almost surely, 2^20552403 is an apocalyptic number.

20552403 is a deficient number, since it is larger than the sum of its proper divisors (7197997).

20552403 is an equidigital number, since it uses as much as digits as its factorization.

20552403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86801.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20552403 is about 4533.4758188392. The cubic root of 20552403 is about 273.9181873419.

Adding to 20552403 its reverse (30425502), we get a palindrome (50977905).

The spelling of 20552403 in words is "twenty million, five hundred fifty-two thousand, four hundred three".