20724620 has 48 divisors (see below), whose sum is σ = 50077440. Its totient is φ = 7057344.

The previous prime is 20724617. The next prime is 20724637. The reversal of 20724620 is 2642702.

It is an unprimeable number.

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, 24647 + ... + 25473.

It is an arithmetic number, because the mean of its divisors is an integer number (1043280).

Almost surely, 2^20724620 is an apocalyptic number.

20724620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20724620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25038720).

20724620 is an abundant number, since it is smaller than the sum of its proper divisors (29352820).

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

20724620 is a wasteful number, since it uses less digits than its factorization.

20724620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20724620 is about 4552.4301202764. The cubic root of 20724620 is about 274.6811511145.

The spelling of 20724620 in words is "twenty million, seven hundred twenty-four thousand, six hundred twenty".