20240421 has 8 divisors (see below), whose sum is σ = 28574784. Its totient is φ = 12699840.

The previous prime is 20240419. The next prime is 20240431. The reversal of 20240421 is 12404202.

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

It is not a de Polignac number, because 20240421 - 2¹ = 20240419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20240421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20240411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198385 + ... + 198486.

It is an arithmetic number, because the mean of its divisors is an integer number (3571848).

Almost surely, 2^20240421 is an apocalyptic number.

It is an amenable number.

20240421 is a deficient number, since it is larger than the sum of its proper divisors (8334363).

20240421 is a wasteful number, since it uses less digits than its factorization.

20240421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396891.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20240421 is about 4498.9355407696. The cubic root of 20240421 is about 272.5251038792.

Adding to 20240421 its reverse (12404202), we get a palindrome (32644623).

The spelling of 20240421 in words is "twenty million, two hundred forty thousand, four hundred twenty-one".