20531420401 has 2 divisors, whose sum is σ = 20531420402. Its totient is φ = 20531420400.

The previous prime is 20531420383. The next prime is 20531420407. The reversal of 20531420401 is 10402413502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15961795600 + 4569624801 = 126340^2 + 67599^2 .

It is a cyclic number.

It is not a de Polignac number, because 20531420401 - 2¹¹ = 20531418353 is a prime.

It is not a weakly prime, because it can be changed into another prime (20531420407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265710200 + 10265710201.

It is an arithmetic number, because the mean of its divisors is an integer number (10265710201).

Almost surely, 2^20531420401 is an apocalyptic number.

It is an amenable number.

20531420401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531420401 is an equidigital number, since it uses as much as digits as its factorization.

20531420401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 20531420401 its reverse (10402413502), we get a palindrome (30933833903).

The spelling of 20531420401 in words is "twenty billion, five hundred thirty-one million, four hundred twenty thousand, four hundred one".