20438361 has 6 divisors (see below), whose sum is σ = 29522090. Its totient is φ = 13625568.

The previous prime is 20438311. The next prime is 20438371. The reversal of 20438361 is 16383402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 4756761 = 3960^2 + 2181^2 .

It is not a de Polignac number, because 20438361 - 2⁹ = 20437849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20438311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1135456 + ... + 1135473.

Almost surely, 2^20438361 is an apocalyptic number.

It is an amenable number.

20438361 is a deficient number, since it is larger than the sum of its proper divisors (9083729).

20438361 is a wasteful number, since it uses less digits than its factorization.

20438361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270935 (or 2270932 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20438361 is about 4520.8805558210. The cubic root of 20438361 is about 273.4106045993.

It can be divided in two parts, 2043 and 8361, that added together give a square (10404 = 102²).

The spelling of 20438361 in words is "twenty million, four hundred thirty-eight thousand, three hundred sixty-one".