20442031 has 4 divisors (see below), whose sum is σ = 20532312. Its totient is φ = 20351752.

The previous prime is 20442011. The next prime is 20442053. The reversal of 20442031 is 13024402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20442031 - 2⁵ = 20441999 is a prime.

It is a super-2 number, since 2×20442031² = 835753262809922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20441996 and 20442014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442011) 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, 44800 + ... + 45253.

It is an arithmetic number, because the mean of its divisors is an integer number (5133078).

Almost surely, 2^20442031 is an apocalyptic number.

20442031 is a deficient number, since it is larger than the sum of its proper divisors (90281).

20442031 is an equidigital number, since it uses as much as digits as its factorization.

20442031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90280.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20442031 is about 4521.2864319793. The cubic root of 20442031 is about 273.4269685479.

Adding to 20442031 its reverse (13024402), we get a palindrome (33466433).

The spelling of 20442031 in words is "twenty million, four hundred forty-two thousand, thirty-one".