20442071 has 24 divisors (see below), whose sum is σ = 23672880. Its totient is φ = 17611776.

The previous prime is 20442061. The next prime is 20442091. The reversal of 20442071 is 17024402.

It is not a de Polignac number, because 20442071 - 2¹⁸ = 20179927 is a prime.

It is a Duffinian number.

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 23 ways as a sum of consecutive naturals, for example, 210695 + ... + 210791.

It is an arithmetic number, because the mean of its divisors is an integer number (986370).

Almost surely, 2^20442071 is an apocalyptic number.

20442071 is a deficient number, since it is larger than the sum of its proper divisors (3230809).

20442071 is a wasteful number, since it uses less digits than its factorization.

20442071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20442071 is about 4521.2908554969. The cubic root of 20442071 is about 273.4271468907.

Adding to 20442071 its reverse (17024402), we get a palindrome (37466473).

The spelling of 20442071 in words is "twenty million, four hundred forty-two thousand, seventy-one".