421340020 has 24 divisors (see below), whose sum is σ = 886573800. Its totient is φ = 168200832.

The previous prime is 421340011. The next prime is 421340021. The reversal of 421340020 is 20043124.

It can be written as a sum of positive squares in 4 ways, for example, as 132204004 + 289136016 = 11498^2 + 17004^2 .

It is a junction number, because it is equal to n+sod(n) for n = 421339976 and 421340003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421340021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10515 + ... + 30874.

It is an arithmetic number, because the mean of its divisors is an integer number (36940575).

Almost surely, 2^421340020 is an apocalyptic number.

It is an amenable number.

421340020 is an abundant number, since it is smaller than the sum of its proper divisors (465233780).

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

421340020 is a wasteful number, since it uses less digits than its factorization.

421340020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41907 (or 41905 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 421340020 is about 20526.5686367693. The cubic root of 421340020 is about 749.6828407137.

Adding to 421340020 its reverse (20043124), we get a palindrome (441383144).

The spelling of 421340020 in words is "four hundred twenty-one million, three hundred forty thousand, twenty".