20544401 has 4 divisors (see below), whose sum is σ = 20561472. Its totient is φ = 20527332.

The previous prime is 20544397. The next prime is 20544427. The reversal of 20544401 is 10444502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10444502 = 2 ⋅5222251.

It is a cyclic number.

It is not a de Polignac number, because 20544401 - 2² = 20544397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20544481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6581 + ... + 9186.

It is an arithmetic number, because the mean of its divisors is an integer number (5140368).

Almost surely, 2^20544401 is an apocalyptic number.

It is an amenable number.

20544401 is a deficient number, since it is larger than the sum of its proper divisors (17071).

20544401 is a wasteful number, since it uses less digits than its factorization.

20544401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17070.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20544401 is about 4532.5931871281. The cubic root of 20544401 is about 273.8826330588.

Adding to 20544401 its reverse (10444502), we get a palindrome (30988903).

The spelling of 20544401 in words is "twenty million, five hundred forty-four thousand, four hundred one".