20238403487 has 2 divisors, whose sum is σ = 20238403488. Its totient is φ = 20238403486.

The previous prime is 20238403481. The next prime is 20238403499. The reversal of 20238403487 is 78430483202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20238403487 - 2²⁶ = 20171294623 is a prime.

It is a super-2 number, since 2×20238403487² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20238403481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10119201743 + 10119201744.

It is an arithmetic number, because the mean of its divisors is an integer number (10119201744).

Almost surely, 2^20238403487 is an apocalyptic number.

20238403487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20238403487 is an equidigital number, since it uses as much as digits as its factorization.

20238403487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 41.

Adding to 20238403487 its reverse (78430483202), we get a palindrome (98668886689).

The spelling of 20238403487 in words is "twenty billion, two hundred thirty-eight million, four hundred three thousand, four hundred eighty-seven".