20412387 has 6 divisors (see below), whose sum is σ = 29484572. Its totient is φ = 13608252.

The previous prime is 20412377. The next prime is 20412397. The reversal of 20412387 is 78321402.

It is an interprime number because it is at equal distance from previous prime (20412377) and next prime (20412397).

It is not a de Polignac number, because 20412387 - 2¹⁴ = 20396003 is a prime.

It is a super-3 number, since 3×20412387³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20412387.

It is not an unprimeable number, because it can be changed into a prime (20412377) 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 5 ways as a sum of consecutive naturals, for example, 1134013 + ... + 1134030.

Almost surely, 2^20412387 is an apocalyptic number.

20412387 is a deficient number, since it is larger than the sum of its proper divisors (9072185).

20412387 is a wasteful number, since it uses less digits than its factorization.

20412387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268049 (or 2268046 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20412387 is about 4518.0069721062. The cubic root of 20412387 is about 273.2947346183.

Adding to 20412387 its reverse (78321402), we get a palindrome (98733789).

The spelling of 20412387 in words is "twenty million, four hundred twelve thousand, three hundred eighty-seven".