20412451 has 4 divisors (see below), whose sum is σ = 20424712. Its totient is φ = 20400192.

The previous prime is 20412409. The next prime is 20412463. The reversal of 20412451 is 15421402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15421402 = 2 ⋅7710701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20412451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20412481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3150 + ... + 7123.

It is an arithmetic number, because the mean of its divisors is an integer number (5106178).

Almost surely, 2^20412451 is an apocalyptic number.

20412451 is a deficient number, since it is larger than the sum of its proper divisors (12261).

20412451 is a wasteful number, since it uses less digits than its factorization.

20412451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12260.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20412451 is about 4518.0140548697. The cubic root of 20412451 is about 273.2950202430.

Adding to 20412451 its reverse (15421402), we get a palindrome (35833853).

The spelling of 20412451 in words is "twenty million, four hundred twelve thousand, four hundred fifty-one".