20142481 has 2 divisors, whose sum is σ = 20142482. Its totient is φ = 20142480.

The previous prime is 20142427. The next prime is 20142509. The reversal of 20142481 is 18424102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 8643600 = 3391^2 + 2940^2 .

It is a cyclic number.

It is not a de Polignac number, because 20142481 - 2²³ = 11753873 is a prime.

It is a super-2 number, since 2×20142481² = 811439081670722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20142401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071240 + 10071241.

It is an arithmetic number, because the mean of its divisors is an integer number (10071241).

Almost surely, 2^20142481 is an apocalyptic number.

It is an amenable number.

20142481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20142481 is an equidigital number, since it uses as much as digits as its factorization.

20142481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 20142481 is about 4488.0375444062. The cubic root of 20142481 is about 272.0848252235.

Adding to 20142481 its reverse (18424102), we get a palindrome (38566583).

The spelling of 20142481 in words is "twenty million, one hundred forty-two thousand, four hundred eighty-one".