20422144 has 20 divisors (see below), whose sum is σ = 40805424. Its totient is φ = 10210816.

The previous prime is 20422139. The next prime is 20422147. The reversal of 20422144 is 44122402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20422147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19432 + ... + 20455.

Almost surely, 2^20422144 is an apocalyptic number.

It is an amenable number.

20422144 is a deficient number, since it is larger than the sum of its proper divisors (20383280).

20422144 is an frugal number, since it uses more digits than its factorization.

20422144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39905 (or 39889 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 20422144 is about 4519.0866333807. The cubic root of 20422144 is about 273.3382721032.

Adding to 20422144 its reverse (44122402), we get a palindrome (64544546).

It can be divided in two parts, 2042 and 2144, that added together give a triangular number (4186 = T₉₁).

The spelling of 20422144 in words is "twenty million, four hundred twenty-two thousand, one hundred forty-four".