20009242 has 16 divisors (see below), whose sum is σ = 34466400. Its totient is φ = 8616240.

The previous prime is 20009183. The next prime is 20009243. The reversal of 20009242 is 24290002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (20009243) 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, 23517 + ... + 24352.

It is an arithmetic number, because the mean of its divisors is an integer number (2154150).

Almost surely, 2^20009242 is an apocalyptic number.

20009242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20009242 is a deficient number, since it is larger than the sum of its proper divisors (14457158).

20009242 is a wasteful number, since it uses less digits than its factorization.

20009242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47901.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20009242 is about 4473.1691226691. The cubic root of 20009242 is about 271.4835663002.

Adding to 20009242 its reverse (24290002), we get a palindrome (44299244).

The spelling of 20009242 in words is "twenty million, nine thousand, two hundred forty-two".