20553001 has 6 divisors (see below), whose sum is σ = 23908650. Its totient is φ = 17616816.

The previous prime is 20552999. The next prime is 20553023. The reversal of 20553001 is 10035502.

It can be written as a sum of positive squares in only one way, i.e., 11909401 + 8643600 = 3451^2 + 2940^2 .

It is not a de Polignac number, because 20553001 - 2¹ = 20552999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20553301) 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 5 ways as a sum of consecutive naturals, for example, 209676 + ... + 209773.

It is an arithmetic number, because the mean of its divisors is an integer number (3984775).

Almost surely, 2^20553001 is an apocalyptic number.

It is an amenable number.

20553001 is a deficient number, since it is larger than the sum of its proper divisors (3355649).

20553001 is an equidigital number, since it uses as much as digits as its factorization.

20553001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419463 (or 419456 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20553001 is about 4533.5417721689. The cubic root of 20553001 is about 273.9208439897.

Adding to 20553001 its reverse (10035502), we get a palindrome (30588503).

The spelling of 20553001 in words is "twenty million, five hundred fifty-three thousand, one".