420020340 has 48 divisors (see below), whose sum is σ = 1216615680. Its totient is φ = 108142720.

The previous prime is 420020339. The next prime is 420020347. The reversal of 420020340 is 43020024.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420020347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118956 + ... + 122435.

It is an arithmetic number, because the mean of its divisors is an integer number (25346160).

Almost surely, 2^420020340 is an apocalyptic number.

It is an amenable number.

420020340 is an abundant number, since it is smaller than the sum of its proper divisors (796595340).

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

420020340 is a wasteful number, since it uses less digits than its factorization.

420020340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241432 (or 241430 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 420020340 is about 20494.3977710983. The cubic root of 420020340 is about 748.8993277064.

Adding to 420020340 its reverse (43020024), we get a palindrome (463040364).

The spelling of 420020340 in words is "four hundred twenty million, twenty thousand, three hundred forty".