20121744 has 40 divisors (see below), whose sum is σ = 55041120. Its totient is φ = 6312448.

The previous prime is 20121719. The next prime is 20121763. The reversal of 20121744 is 44712102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121744.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11514 + ... + 13145.

It is an arithmetic number, because the mean of its divisors is an integer number (1376028).

Almost surely, 2^20121744 is an apocalyptic number.

20121744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20121744 is an abundant number, since it is smaller than the sum of its proper divisors (34919376).

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

20121744 is a wasteful number, since it uses less digits than its factorization.

20121744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24687 (or 24681 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20121744 is about 4485.7266969801. The cubic root of 20121744 is about 271.9914212981.

Adding to 20121744 its reverse (44712102), we get a palindrome (64833846).

It can be divided in two parts, 201 and 21744, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 20121744 in words is "twenty million, one hundred twenty-one thousand, seven hundred forty-four".