20420532232453 has 2 divisors, whose sum is σ = 20420532232454. Its totient is φ = 20420532232452.

The previous prime is 20420532232439. The next prime is 20420532232493. The reversal of 20420532232453 is 35423223502402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15824340792324 + 4596191440129 = 3977982^2 + 2143873^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20420532232453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420532232493) 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 as a sum of consecutive naturals, namely, 10210266116226 + 10210266116227.

It is an arithmetic number, because the mean of its divisors is an integer number (10210266116227).

Almost surely, 2^{20420532232453} is an apocalyptic number.

It is an amenable number.

20420532232453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420532232453 is an equidigital number, since it uses as much as digits as its factorization.

20420532232453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 37.

Adding to 20420532232453 its reverse (35423223502402), we get a palindrome (55843755734855).

The spelling of 20420532232453 in words is "twenty trillion, four hundred twenty billion, five hundred thirty-two million, two hundred thirty-two thousand, four hundred fifty-three".