1321936020 has 144 divisors (see below), whose sum is σ = 4272690240. Its totient is φ = 329868288.

The previous prime is 1321936019. The next prime is 1321936027. The reversal of 1321936020 is 206391231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321936027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 281532 + ... + 286188.

It is an arithmetic number, because the mean of its divisors is an integer number (29671460).

Almost surely, 2^1321936020 is an apocalyptic number.

1321936020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321936020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2136345120).

1321936020 is an abundant number, since it is smaller than the sum of its proper divisors (2950754220).

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

1321936020 is a wasteful number, since it uses less digits than its factorization.

1321936020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4774 (or 4769 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 1321936020 is about 36358.4380852643. The cubic root of 1321936020 is about 1097.4973462437.

The spelling of 1321936020 in words is "one billion, three hundred twenty-one million, nine hundred thirty-six thousand, twenty".