42109020 has 36 divisors (see below), whose sum is σ = 127731240. Its totient is φ = 11229024.

The previous prime is 42109013. The next prime is 42109037. The reversal of 42109020 is 2090124.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 42108984 and 42109002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116790 + ... + 117149.

It is an arithmetic number, because the mean of its divisors is an integer number (3548090).

Almost surely, 2^42109020 is an apocalyptic number.

It is an amenable number.

42109020 is an abundant number, since it is smaller than the sum of its proper divisors (85622220).

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

42109020 is a wasteful number, since it uses less digits than its factorization.

42109020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233954 (or 233949 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 42109020 is about 6489.1463228995. The cubic root of 42109020 is about 347.9031637024.

Adding to 42109020 its reverse (2090124), we get a palindrome (44199144).

The spelling of 42109020 in words is "forty-two million, one hundred nine thousand, twenty".