20438919 has 16 divisors (see below), whose sum is σ = 30384640. Its totient is φ = 13578840.

The previous prime is 20438909. The next prime is 20438923. The reversal of 20438919 is 91983402.

It is not a de Polignac number, because 20438919 - 2⁷ = 20438791 is a prime.

It is a super-2 number, since 2×20438919² = 835498819777122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7794 + ... + 10080.

It is an arithmetic number, because the mean of its divisors is an integer number (1899040).

Almost surely, 2^20438919 is an apocalyptic number.

20438919 is a deficient number, since it is larger than the sum of its proper divisors (9945721).

20438919 is a wasteful number, since it uses less digits than its factorization.

20438919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627 (or 2621 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20438919 is about 4520.9422690408. The cubic root of 20438919 is about 273.4130927591.

The spelling of 20438919 in words is "twenty million, four hundred thirty-eight thousand, nine hundred nineteen".