43861000020 has 96 divisors (see below), whose sum is σ = 125392458240. Its totient is φ = 11451984000.

The previous prime is 43861000019. The next prime is 43861000031. The reversal of 43861000020 is 2000016834.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 863859 + ... + 913221.

It is an arithmetic number, because the mean of its divisors is an integer number (1306171440).

Almost surely, 2^43861000020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43861000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62696229120).

43861000020 is an abundant number, since it is smaller than the sum of its proper divisors (81531458220).

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

43861000020 is a wasteful number, since it uses less digits than its factorization.

43861000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49685 (or 49683 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 43861000020 its reverse (2000016834), we get a palindrome (45861016854).

The spelling of 43861000020 in words is "forty-three billion, eight hundred sixty-one million, twenty", and thus it is an aban number.