20940401 has 4 divisors (see below), whose sum is σ = 21015204. Its totient is φ = 20865600.

The previous prime is 20940389. The next prime is 20940421. The reversal of 20940401 is 10404902.

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 14258176 + 6682225 = 3776^2 + 2585^2 .

It is a cyclic number.

It is not a de Polignac number, because 20940401 - 2²² = 16746097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20940421) 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, 36980 + ... + 37541.

It is an arithmetic number, because the mean of its divisors is an integer number (5253801).

Almost surely, 2^20940401 is an apocalyptic number.

It is an amenable number.

20940401 is a deficient number, since it is larger than the sum of its proper divisors (74803).

20940401 is an equidigital number, since it uses as much as digits as its factorization.

20940401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74802.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20940401 is about 4576.0682905743. The cubic root of 20940401 is about 275.6311717329.

The spelling of 20940401 in words is "twenty million, nine hundred forty thousand, four hundred one".