20387438 has 8 divisors (see below), whose sum is σ = 30607632. Its totient is φ = 10184896.

The previous prime is 20387431. The next prime is 20387441. The reversal of 20387438 is 83478302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20387398 and 20387407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20387431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995 + ... + 6462.

It is an arithmetic number, because the mean of its divisors is an integer number (3825954).

Almost surely, 2^20387438 is an apocalyptic number.

20387438 is the 2414-th centered heptagonal number.

20387438 is a deficient number, since it is larger than the sum of its proper divisors (10220194).

20387438 is a wasteful number, since it uses less digits than its factorization.

20387438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8826.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 20387438 is about 4515.2450653314. The cubic root of 20387438 is about 273.1833445726.

The spelling of 20387438 in words is "twenty million, three hundred eighty-seven thousand, four hundred thirty-eight".