1201001020 has 48 divisors (see below), whose sum is σ = 2658096000. Its totient is φ = 454559040.

The previous prime is 1201001017. The next prime is 1201001029. The reversal of 1201001020 is 201001021.

It is a junction number, because it is equal to n+sod(n) for n = 1201000994 and 1201001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201001029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443631 + ... + 446329.

It is an arithmetic number, because the mean of its divisors is an integer number (55377000).

Almost surely, 2^1201001020 is an apocalyptic number.

1201001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201001020 is an abundant number, since it is smaller than the sum of its proper divisors (1457094980).

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

1201001020 is a wasteful number, since it uses less digits than its factorization.

1201001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3898 (or 3896 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1201001020 is about 34655.4616186251. The cubic root of 1201001020 is about 1062.9539710805.

Adding to 1201001020 its reverse (201001021), we get a palindrome (1402002041).

Subtracting from 1201001020 its reverse (201001021), we obtain a palindrome (999999999).

The spelling of 1201001020 in words is "one billion, two hundred one million, one thousand, twenty".