1200451020 has 48 divisors (see below), whose sum is σ = 3378358368. Its totient is φ = 318492160.

The previous prime is 1200451019. The next prime is 1200451033. The reversal of 1200451020 is 201540021.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38961 + ... + 62600.

It is an arithmetic number, because the mean of its divisors is an integer number (70382466).

Almost surely, 2^1200451020 is an apocalyptic number.

1200451020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200451020 is an abundant number, since it is smaller than the sum of its proper divisors (2177907348).

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

1200451020 is a wasteful number, since it uses less digits than its factorization.

1200451020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101770 (or 101768 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1200451020 is about 34647.5254527650. The cubic root of 1200451020 is about 1062.7916859144.

Adding to 1200451020 its reverse (201540021), we get a palindrome (1401991041).

The spelling of 1200451020 in words is "one billion, two hundred million, four hundred fifty-one thousand, twenty".