210040020 has 48 divisors (see below), whose sum is σ = 653459520. Its totient is φ = 56010528.

The previous prime is 210040013. The next prime is 210040027. The reversal of 210040020 is 20040012.

It is an interprime number because it is at equal distance from previous prime (210040013) and next prime (210040027).

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

It is a junction number, because it is equal to n+sod(n) for n = 210039984 and 210040011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210040027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193942 + ... + 195021.

It is an arithmetic number, because the mean of its divisors is an integer number (13613740).

Almost surely, 2^210040020 is an apocalyptic number.

210040020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210040020 is an abundant number, since it is smaller than the sum of its proper divisors (443419500).

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

210040020 is a wasteful number, since it uses less digits than its factorization.

210040020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388981 (or 388973 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 210040020 is about 14492.7575015937. The cubic root of 210040020 is about 594.4299509346.

Adding to 210040020 its reverse (20040012), we get a palindrome (230080032).

The spelling of 210040020 in words is "two hundred ten million, forty thousand, twenty".