1220020987 has 2 divisors, whose sum is σ = 1220020988. Its totient is φ = 1220020986.

The previous prime is 1220020979. The next prime is 1220021009. The reversal of 1220020987 is 7890200221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220020987 - 2³ = 1220020979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220020927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610010493 + 610010494.

It is an arithmetic number, because the mean of its divisors is an integer number (610010494).

Almost surely, 2^1220020987 is an apocalyptic number.

1220020987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220020987 is an equidigital number, since it uses as much as digits as its factorization.

1220020987 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.

The square root of 1220020987 is about 34928.7988198850. The cubic root of 1220020987 is about 1068.5358572267.

The spelling of 1220020987 in words is "one billion, two hundred twenty million, twenty thousand, nine hundred eighty-seven".