20634401 has 4 divisors (see below), whose sum is σ = 20838804. Its totient is φ = 20430000.

The previous prime is 20634389. The next prime is 20634403. The reversal of 20634401 is 10443602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20070400 + 564001 = 4480^2 + 751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20634401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20634403) 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 3 ways as a sum of consecutive naturals, for example, 102050 + ... + 102251.

It is an arithmetic number, because the mean of its divisors is an integer number (5209701).

Almost surely, 2^20634401 is an apocalyptic number.

It is an amenable number.

20634401 is a deficient number, since it is larger than the sum of its proper divisors (204403).

20634401 is a wasteful number, since it uses less digits than its factorization.

20634401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204402.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20634401 is about 4542.5104292671. The cubic root of 20634401 is about 274.2819880937.

The spelling of 20634401 in words is "twenty million, six hundred thirty-four thousand, four hundred one".