420820722 has 72 divisors (see below), whose sum is σ = 1094925312. Its totient is φ = 116348400.

The previous prime is 420820663. The next prime is 420820781. The reversal of 420820722 is 227028024.

It is an interprime number because it is at equal distance from previous prime (420820663) and next prime (420820781).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19647 + ... + 35037.

It is an arithmetic number, because the mean of its divisors is an integer number (15207296).

Almost surely, 2^420820722 is an apocalyptic number.

420820722 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 420820722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (547462656).

420820722 is an abundant number, since it is smaller than the sum of its proper divisors (674104590).

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

420820722 is a wasteful number, since it uses less digits than its factorization.

420820722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15444 (or 15434 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 420820722 is about 20513.9153259440. The cubic root of 420820722 is about 749.3747215140.

Adding to 420820722 its reverse (227028024), we get a palindrome (647848746).

The spelling of 420820722 in words is "four hundred twenty million, eight hundred twenty thousand, seven hundred twenty-two".