43000020 has 72 divisors (see below), whose sum is σ = 149071104. Its totient is φ = 9828288.

The previous prime is 43000019. The next prime is 43000037. The reversal of 43000020 is 2000034.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 42999966 and 43000011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15804 + ... + 18323.

It is an arithmetic number, because the mean of its divisors is an integer number (2070432).

Almost surely, 2^43000020 is an apocalyptic number.

It is an amenable number.

43000020 is an abundant number, since it is smaller than the sum of its proper divisors (106071084).

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

43000020 is a wasteful number, since it uses less digits than its factorization.

43000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34149 (or 34144 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 43000020 is about 6557.4400492875. The cubic root of 43000020 is about 350.3398603549.

Adding to 43000020 its reverse (2000034), we get a palindrome (45000054).

The spelling of 43000020 in words is "forty-three million, twenty", and thus it is an aban number and an uban number.