20438744 has 8 divisors (see below), whose sum is σ = 38322660. Its totient is φ = 10219368.

The previous prime is 20438729. The next prime is 20438767. The reversal of 20438744 is 44783402.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20438744.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277414 + ... + 1277429.

Almost surely, 2^20438744 is an apocalyptic number.

It is an amenable number.

20438744 is a deficient number, since it is larger than the sum of its proper divisors (17883916).

20438744 is a wasteful number, since it uses less digits than its factorization.

20438744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554849 (or 2554845 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 20438744 is about 4520.9229146271. The cubic root of 20438744 is about 273.4123124271.

The spelling of 20438744 in words is "twenty million, four hundred thirty-eight thousand, seven hundred forty-four".