20406441 has 8 divisors (see below), whose sum is σ = 29682144. Its totient is φ = 12367520.

The previous prime is 20406439. The next prime is 20406461. The reversal of 20406441 is 14460402.

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

It is not a de Polignac number, because 20406441 - 2¹ = 20406439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20406461) 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, 309156 + ... + 309221.

It is an arithmetic number, because the mean of its divisors is an integer number (3710268).

Almost surely, 2^20406441 is an apocalyptic number.

It is an amenable number.

20406441 is a deficient number, since it is larger than the sum of its proper divisors (9275703).

20406441 is a wasteful number, since it uses less digits than its factorization.

20406441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618391.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20406441 is about 4517.3488906659. The cubic root of 20406441 is about 273.2681956953.

Adding to 20406441 its reverse (14460402), we get a palindrome (34866843).

The spelling of 20406441 in words is "twenty million, four hundred six thousand, four hundred forty-one".