20642344 has 16 divisors (see below), whose sum is σ = 38855520. Its totient is φ = 10280880.

The previous prime is 20642299. The next prime is 20642351. The reversal of 20642344 is 44324602.

It is a super-2 number, since 2×20642344² = 852212731628672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2802 + ... + 7009.

It is an arithmetic number, because the mean of its divisors is an integer number (2428470).

Almost surely, 2^20642344 is an apocalyptic number.

It is an amenable number.

20642344 is a deficient number, since it is larger than the sum of its proper divisors (18213176).

20642344 is a wasteful number, since it uses less digits than its factorization.

20642344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10080 (or 10076 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 20642344 is about 4543.3846414320. The cubic root of 20642344 is about 274.3171775870.

Adding to 20642344 its reverse (44324602), we get a palindrome (64966946).

The spelling of 20642344 in words is "twenty million, six hundred forty-two thousand, three hundred forty-four".