20401133 has 4 divisors (see below), whose sum is σ = 20581788. Its totient is φ = 20220480.

The previous prime is 20401127. The next prime is 20401141. The reversal of 20401133 is 33110402.

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 1408969 + 18992164 = 1187^2 + 4358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20401133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401033) 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, 90158 + ... + 90383.

It is an arithmetic number, because the mean of its divisors is an integer number (5145447).

Almost surely, 2^20401133 is an apocalyptic number.

It is an amenable number.

20401133 is a deficient number, since it is larger than the sum of its proper divisors (180655).

20401133 is a wasteful number, since it uses less digits than its factorization.

20401133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180654.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20401133 is about 4516.7613397212. The cubic root of 20401133 is about 273.2445000172.

Adding to 20401133 its reverse (33110402), we get a palindrome (53511535).

The spelling of 20401133 in words is "twenty million, four hundred one thousand, one hundred thirty-three".