20442006 has 24 divisors (see below), whose sum is σ = 47698560. Its totient is φ = 6289776.

The previous prime is 20441999. The next prime is 20442011. The reversal of 20442006 is 60024402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 20442006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43446 + ... + 43913.

It is an arithmetic number, because the mean of its divisors is an integer number (1987440).

Almost surely, 2^20442006 is an apocalyptic number.

20442006 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20442006 is an abundant number, since it is smaller than the sum of its proper divisors (27256554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20442006 is a wasteful number, since it uses less digits than its factorization.

20442006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87380 (or 87377 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20442006 is about 4521.2836672786. The cubic root of 20442006 is about 273.4268570834.

Adding to 20442006 its reverse (60024402), we get a palindrome (80466408).

The spelling of 20442006 in words is "twenty million, four hundred forty-two thousand, six".