1201645020 has 48 divisors (see below), whose sum is σ = 3382071840. Its totient is φ = 318775296.

The previous prime is 1201645013. The next prime is 1201645057. The reversal of 1201645020 is 205461021.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40305 + ... + 63464.

It is an arithmetic number, because the mean of its divisors is an integer number (70459830).

Almost surely, 2^1201645020 is an apocalyptic number.

1201645020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201645020 is an abundant number, since it is smaller than the sum of its proper divisors (2180426820).

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

1201645020 is a wasteful number, since it uses less digits than its factorization.

1201645020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103974 (or 103972 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1201645020 is about 34664.7518381424. The cubic root of 1201645020 is about 1063.1439292980.

The spelling of 1201645020 in words is "one billion, two hundred one million, six hundred forty-five thousand, twenty".