20212144 has 10 divisors (see below), whose sum is σ = 39161060. Its totient is φ = 10106064.

The previous prime is 20212117. The next prime is 20212151. The reversal of 20212144 is 44121202.

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 1263259 = 20212144 / (2 + 0 + 2 + 1 + 2 + 1 + 4 + 4).

It is an unprimeable number.

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, 631614 + ... + 631645.

It is an arithmetic number, because the mean of its divisors is an integer number (3916106).

Almost surely, 2^20212144 is an apocalyptic number.

It is an amenable number.

20212144 is a deficient number, since it is larger than the sum of its proper divisors (18948916).

20212144 is a wasteful number, since it uses less digits than its factorization.

20212144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263267 (or 1263261 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 20212144 is about 4495.7918101264. The cubic root of 20212144 is about 272.3981337961.

Adding to 20212144 its reverse (44121202), we get a palindrome (64333346).

The spelling of 20212144 in words is "twenty million, two hundred twelve thousand, one hundred forty-four".