2031011820 has 120 divisors (see below), whose sum is σ = 6391489104. Its totient is φ = 539892864.

The previous prime is 2031011797. The next prime is 2031011861. The reversal of 2031011820 is 281101302.

It is a super-4 number, since 4×2031011820⁴ (a number of 38 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2031011793 and 2031011802.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 560334 + ... + 563946.

Almost surely, 2^2031011820 is an apocalyptic number.

2031011820 is a gapful number since it is divisible by the number (20) 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 2031011820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3195744552).

2031011820 is an abundant number, since it is smaller than the sum of its proper divisors (4360477284).

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

2031011820 is a wasteful number, since it uses less digits than its factorization.

2031011820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3981 (or 3970 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 2031011820 is about 45066.7484959809. The cubic root of 2031011820 is about 1266.3997524697.

The spelling of 2031011820 in words is "two billion, thirty-one million, eleven thousand, eight hundred twenty".