20420463 has 8 divisors (see below), whose sum is σ = 31116928. Its totient is φ = 11668824.

The previous prime is 20420453. The next prime is 20420479. The reversal of 20420463 is 36402402.

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

It is not a de Polignac number, because 20420463 - 2⁸ = 20420207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 972403 = 20420463 / (2 + 0 + 4 + 2 + 0 + 4 + 6 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420443) 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 7 ways as a sum of consecutive naturals, for example, 486181 + ... + 486222.

It is an arithmetic number, because the mean of its divisors is an integer number (3889616).

Almost surely, 2^20420463 is an apocalyptic number.

20420463 is a deficient number, since it is larger than the sum of its proper divisors (10696465).

20420463 is an equidigital number, since it uses as much as digits as its factorization.

20420463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972413.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20420463 is about 4518.9006406426. The cubic root of 20420463 is about 273.3307721685.

Adding to 20420463 its reverse (36402402), we get a palindrome (56822865).

The spelling of 20420463 in words is "twenty million, four hundred twenty thousand, four hundred sixty-three".