42156020 has 24 divisors (see below), whose sum is σ = 88657800. Its totient is φ = 16837632.

The previous prime is 42156017. The next prime is 42156043. The reversal of 42156020 is 2065124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7628644 + 34527376 = 2762^2 + 5876^2 .

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 = 42155983 and 42156001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19136 + ... + 21224.

It is an arithmetic number, because the mean of its divisors is an integer number (3694075).

Almost surely, 2^42156020 is an apocalyptic number.

It is an amenable number.

42156020 is an abundant number, since it is smaller than the sum of its proper divisors (46501780).

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

42156020 is a wasteful number, since it uses less digits than its factorization.

42156020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107 (or 3105 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 42156020 is about 6492.7667446167. The cubic root of 42156020 is about 348.0325529948.

The spelling of 42156020 in words is "forty-two million, one hundred fifty-six thousand, twenty".