20670401 has 4 divisors (see below), whose sum is σ = 21151152. Its totient is φ = 20189652.

The previous prime is 20670379. The next prime is 20670421. The reversal of 20670401 is 10407602.

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.

It is a cyclic number.

It is not a de Polignac number, because 20670401 - 2⁶ = 20670337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20670421) 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, 240311 + ... + 240396.

It is an arithmetic number, because the mean of its divisors is an integer number (5287788).

Almost surely, 2^20670401 is an apocalyptic number.

It is an amenable number.

20670401 is a deficient number, since it is larger than the sum of its proper divisors (480751).

20670401 is an equidigital number, since it uses as much as digits as its factorization.

20670401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480750.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20670401 is about 4546.4712690173. The cubic root of 20670401 is about 274.4414049624.

It can be divided in two parts, 206 and 70401, that added together give a palindrome (70607).

The spelling of 20670401 in words is "twenty million, six hundred seventy thousand, four hundred one".