20201244487 has 2 divisors, whose sum is σ = 20201244488. Its totient is φ = 20201244486.

The previous prime is 20201244373. The next prime is 20201244491. The reversal of 20201244487 is 78444210202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201244487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201244787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100622243 + 10100622244.

It is an arithmetic number, because the mean of its divisors is an integer number (10100622244).

Almost surely, 2^20201244487 is an apocalyptic number.

20201244487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201244487 is an equidigital number, since it uses as much as digits as its factorization.

20201244487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28672, while the sum is 34.

Adding to 20201244487 its reverse (78444210202), we get a palindrome (98645454689).

The spelling of 20201244487 in words is "twenty billion, two hundred one million, two hundred forty-four thousand, four hundred eighty-seven".