20524303421 has 4 divisors (see below), whose sum is σ = 20533303644. Its totient is φ = 20515303200.

The previous prime is 20524303403. The next prime is 20524303433. The reversal of 20524303421 is 12430342502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4162056196 + 16362247225 = 64514^2 + 127915^2 .

It is a cyclic number.

It is not a de Polignac number, because 20524303421 - 2¹⁴ = 20524287037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20524303721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4496690 + ... + 4501251.

It is an arithmetic number, because the mean of its divisors is an integer number (5133325911).

Almost surely, 2^20524303421 is an apocalyptic number.

It is an amenable number.

20524303421 is a deficient number, since it is larger than the sum of its proper divisors (9000223).

20524303421 is an equidigital number, since it uses as much as digits as its factorization.

20524303421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000222.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 20524303421 its reverse (12430342502), we get a palindrome (32954645923).

The spelling of 20524303421 in words is "twenty billion, five hundred twenty-four million, three hundred three thousand, four hundred twenty-one".