20387369 has 4 divisors (see below), whose sum is σ = 21586644. Its totient is φ = 19188096.

The previous prime is 20387357. The next prime is 20387371. The reversal of 20387369 is 96378302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13601344 + 6786025 = 3688^2 + 2605^2 .

It is a cyclic number.

It is not a de Polignac number, because 20387369 - 2⁸ = 20387113 is a prime.

It is a super-2 number, since 2×20387369² = 831289629484322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20387069) 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, 599612 + ... + 599645.

It is an arithmetic number, because the mean of its divisors is an integer number (5396661).

Almost surely, 2^20387369 is an apocalyptic number.

It is an amenable number.

20387369 is a deficient number, since it is larger than the sum of its proper divisors (1199275).

20387369 is a wasteful number, since it uses less digits than its factorization.

20387369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199274.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20387369 is about 4515.2374245437. The cubic root of 20387369 is about 273.1830363817.

The spelling of 20387369 in words is "twenty million, three hundred eighty-seven thousand, three hundred sixty-nine".