20010220987 has 2 divisors, whose sum is σ = 20010220988. Its totient is φ = 20010220986.

The previous prime is 20010220939. The next prime is 20010221039. The reversal of 20010220987 is 78902201002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010220987 is a prime.

It is not a weakly prime, because it can be changed into another prime (20010220387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005110493 + 10005110494.

It is an arithmetic number, because the mean of its divisors is an integer number (10005110494).

Almost surely, 2^20010220987 is an apocalyptic number.

20010220987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010220987 is an equidigital number, since it uses as much as digits as its factorization.

20010220987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 20010220987 its reverse (78902201002), we get a palindrome (98912421989).

The spelling of 20010220987 in words is "twenty billion, ten million, two hundred twenty thousand, nine hundred eighty-seven".