20021242 has 8 divisors (see below), whose sum is σ = 30096000. Its totient is φ = 9989244.

The previous prime is 20021233. The next prime is 20021251. The reversal of 20021242 is 24212002.

It is an interprime number because it is at equal distance from previous prime (20021233) and next prime (20021251).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9492 + ... + 11407.

It is an arithmetic number, because the mean of its divisors is an integer number (3762000).

Almost surely, 2^20021242 is an apocalyptic number.

20021242 is a deficient number, since it is larger than the sum of its proper divisors (10074758).

20021242 is a wasteful number, since it uses less digits than its factorization.

20021242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21380.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20021242 is about 4474.5102525304. The cubic root of 20021242 is about 271.5378270888.

Adding to 20021242 its reverse (24212002), we get a palindrome (44233244).

The spelling of 20021242 in words is "twenty million, twenty-one thousand, two hundred forty-two".