20542424501 has 2 divisors, whose sum is σ = 20542424502. Its totient is φ = 20542424500.

The previous prime is 20542424491. The next prime is 20542424509. The reversal of 20542424501 is 10542424502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11014712401 + 9527712100 = 104951^2 + 97610^2 .

It is a cyclic number.

It is not a de Polignac number, because 20542424501 - 2²² = 20538230197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20542424509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271212250 + 10271212251.

It is an arithmetic number, because the mean of its divisors is an integer number (10271212251).

Almost surely, 2^20542424501 is an apocalyptic number.

It is an amenable number.

20542424501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542424501 is an equidigital number, since it uses as much as digits as its factorization.

20542424501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12800, while the sum is 29.

Subtracting from 20542424501 its reverse (10542424502), we obtain a palindrome (9999999999).

The spelling of 20542424501 in words is "twenty billion, five hundred forty-two million, four hundred twenty-four thousand, five hundred one".