1201636020 has 48 divisors (see below), whose sum is σ = 3623397120. Its totient is φ = 295787136.

The previous prime is 1201636003. The next prime is 1201636031. The reversal of 1201636020 is 206361021.

It is a happy number.

1201636020 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1201636020² = 2887858249122880800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769500 + ... + 771059.

It is an arithmetic number, because the mean of its divisors is an integer number (75487440).

Almost surely, 2^1201636020 is an apocalyptic number.

1201636020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201636020 is an abundant number, since it is smaller than the sum of its proper divisors (2421761100).

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

1201636020 is a wasteful number, since it uses less digits than its factorization.

1201636020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540584 (or 1540582 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1201636020 is about 34664.6220230367. The cubic root of 1201636020 is about 1063.1412750701.

Adding to 1201636020 its reverse (206361021), we get a palindrome (1407997041).

The spelling of 1201636020 in words is "one billion, two hundred one million, six hundred thirty-six thousand, twenty".