1155142020 has 24 divisors (see below), whose sum is σ = 3234397824. Its totient is φ = 308037856.

The previous prime is 1155141973. The next prime is 1155142039. The reversal of 1155142020 is 202415511.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9626124 + ... + 9626243.

It is an arithmetic number, because the mean of its divisors is an integer number (134766576).

Almost surely, 2^1155142020 is an apocalyptic number.

1155142020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155142020 is an abundant number, since it is smaller than the sum of its proper divisors (2079255804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155142020 is a wasteful number, since it uses less digits than its factorization.

1155142020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19252379 (or 19252377 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1155142020 is about 33987.3803050485. The cubic root of 1155142020 is about 1049.2487506094.

Adding to 1155142020 its reverse (202415511), we get a palindrome (1357557531).

The spelling of 1155142020 in words is "one billion, one hundred fifty-five million, one hundred forty-two thousand, twenty".