20442429 has 16 divisors (see below), whose sum is σ = 34611840. Its totient is φ = 11681280.

The previous prime is 20442427. The next prime is 20442439. The reversal of 20442429 is 92424402.

It is not a de Polignac number, because 20442429 - 2¹ = 20442427 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442427) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 53892 + ... + 54269.

It is an arithmetic number, because the mean of its divisors is an integer number (2163240).

Almost surely, 2^20442429 is an apocalyptic number.

It is an amenable number.

20442429 is a deficient number, since it is larger than the sum of its proper divisors (14169411).

20442429 is a wasteful number, since it uses less digits than its factorization.

20442429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108177 (or 108171 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 20442429 is about 4521.3304457869. The cubic root of 20442429 is about 273.4287430491.

The spelling of 20442429 in words is "twenty million, four hundred forty-two thousand, four hundred twenty-nine".