20402241 has 8 divisors (see below), whose sum is σ = 27355680. Its totient is φ = 13525152.

The previous prime is 20402233. The next prime is 20402251. The reversal of 20402241 is 14220402.

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

It is not a de Polignac number, because 20402241 - 2³ = 20402233 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20402241.

It is not an unprimeable number, because it can be changed into a prime (20402201) 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, 18460 + ... + 19533.

It is an arithmetic number, because the mean of its divisors is an integer number (3419460).

Almost surely, 2^20402241 is an apocalyptic number.

It is an amenable number.

20402241 is a deficient number, since it is larger than the sum of its proper divisors (6953439).

20402241 is a wasteful number, since it uses less digits than its factorization.

20402241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38175.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20402241 is about 4516.8839923115. The cubic root of 20402241 is about 273.2494466285.

Adding to 20402241 its reverse (14220402), we get a palindrome (34622643).

The spelling of 20402241 in words is "twenty million, four hundred two thousand, two hundred forty-one".