20988438 has 32 divisors (see below), whose sum is σ = 44776800. Its totient is φ = 6535680.

The previous prime is 20988437. The next prime is 20988467. The reversal of 20988438 is 83488902.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20988438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14508 + ... + 15888.

It is an arithmetic number, because the mean of its divisors is an integer number (1399275).

Almost surely, 2^20988438 is an apocalyptic number.

20988438 is an abundant number, since it is smaller than the sum of its proper divisors (23788362).

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

20988438 is a wasteful number, since it uses less digits than its factorization.

20988438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552.

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 20988438 is about 4581.3140036457. The cubic root of 20988438 is about 275.8417755154.

The spelling of 20988438 in words is "twenty million, nine hundred eighty-eight thousand, four hundred thirty-eight".