20462421 has 8 divisors (see below), whose sum is σ = 31180864. Its totient is φ = 11692800.

The previous prime is 20462419. The next prime is 20462423. The reversal of 20462421 is 12426402.

It is an interprime number because it is at equal distance from previous prime (20462419) and next prime (20462423).

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

It is not a de Polignac number, because 20462421 - 2¹ = 20462419 is a prime.

It is a super-3 number, since 3×20462421³ (a number of 23 digits) contains 333 as substring.

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: 974401 = 20462421 / (2 + 0 + 4 + 6 + 2 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20462423) 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 7 ways as a sum of consecutive naturals, for example, 487180 + ... + 487221.

It is an arithmetic number, because the mean of its divisors is an integer number (3897608).

Almost surely, 2^20462421 is an apocalyptic number.

20462421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20462421 is a deficient number, since it is larger than the sum of its proper divisors (10718443).

20462421 is an equidigital number, since it uses as much as digits as its factorization.

20462421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974411.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20462421 is about 4523.5407591841. The cubic root of 20462421 is about 273.5178486770.

Adding to 20462421 its reverse (12426402), we get a palindrome (32888823).

The spelling of 20462421 in words is "twenty million, four hundred sixty-two thousand, four hundred twenty-one".