20021457587 has 2 divisors, whose sum is σ = 20021457588. Its totient is φ = 20021457586.

The previous prime is 20021457569. The next prime is 20021457641. The reversal of 20021457587 is 78575412002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021457587 - 2¹⁶ = 20021392051 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021457527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010728793 + 10010728794.

It is an arithmetic number, because the mean of its divisors is an integer number (10010728794).

Almost surely, 2^20021457587 is an apocalyptic number.

20021457587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021457587 is an equidigital number, since it uses as much as digits as its factorization.

20021457587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156800, while the sum is 41.

Adding to 20021457587 its reverse (78575412002), we get a palindrome (98596869589).

The spelling of 20021457587 in words is "twenty billion, twenty-one million, four hundred fifty-seven thousand, five hundred eighty-seven".