3081240020 has 24 divisors (see below), whose sum is σ = 6471650304. Its totient is φ = 1232296736.

The previous prime is 3081239999. The next prime is 3081240023. The reversal of 3081240020 is 200421803.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3081239974 and 3081240001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3081240023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221717 + ... + 235203.

It is an arithmetic number, because the mean of its divisors is an integer number (269652096).

Almost surely, 2^3081240020 is an apocalyptic number.

It is an amenable number.

3081240020 is an abundant number, since it is smaller than the sum of its proper divisors (3390410284).

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

3081240020 is a wasteful number, since it uses less digits than its factorization.

3081240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24919 (or 24917 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 3081240020 is about 55508.9183825446. The cubic root of 3081240020 is about 1455.1525007155.

Adding to 3081240020 its reverse (200421803), we get a palindrome (3281661823).

The spelling of 3081240020 in words is "three billion, eighty-one million, two hundred forty thousand, twenty".