1020720087 has 12 divisors (see below), whose sum is σ = 1474758480. Its totient is φ = 680302368.

The previous prime is 1020720083. The next prime is 1020720089. The reversal of 1020720087 is 7800270201.

It is not a de Polignac number, because 1020720087 - 2² = 1020720083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020720087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020720083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28123 + ... + 53219.

It is an arithmetic number, because the mean of its divisors is an integer number (122896540).

Almost surely, 2^1020720087 is an apocalyptic number.

1020720087 is a deficient number, since it is larger than the sum of its proper divisors (454038393).

1020720087 is a wasteful number, since it uses less digits than its factorization.

1020720087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29622 (or 29619 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1020720087 is about 31948.7102556582. The cubic root of 1020720087 is about 1006.8595348604.

Adding to 1020720087 its reverse (7800270201), we get a palindrome (8820990288).

The spelling of 1020720087 in words is "one billion, twenty million, seven hundred twenty thousand, eighty-seven".