20581401 has 8 divisors (see below), whose sum is σ = 27818080. Its totient is φ = 13532832.

The previous prime is 20581399. The next prime is 20581403. The reversal of 20581401 is 10418502.

It is an interprime number because it is at equal distance from previous prime (20581399) and next prime (20581403).

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

It is not a de Polignac number, because 20581401 - 2¹ = 20581399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20581403) 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, 46771 + ... + 47208.

It is an arithmetic number, because the mean of its divisors is an integer number (3477260).

Almost surely, 2^20581401 is an apocalyptic number.

It is an amenable number.

20581401 is a deficient number, since it is larger than the sum of its proper divisors (7236679).

20581401 is an equidigital number, since it uses as much as digits as its factorization.

20581401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94055.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20581401 is about 4536.6728998243. The cubic root of 20581401 is about 274.0469532550.

Adding to 20581401 its reverse (10418502), we get a palindrome (30999903).

The spelling of 20581401 in words is "twenty million, five hundred eighty-one thousand, four hundred one".