20624820 has 48 divisors (see below), whose sum is σ = 58188480. Its totient is φ = 5458176.

The previous prime is 20624809. The next prime is 20624831. The reversal of 20624820 is 2842602.

It is an interprime number because it is at equal distance from previous prime (20624809) and next prime (20624831).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7104 + ... + 9576.

It is an arithmetic number, because the mean of its divisors is an integer number (1212260).

Almost surely, 2^20624820 is an apocalyptic number.

20624820 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 20624820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29094240).

20624820 is an abundant number, since it is smaller than the sum of its proper divisors (37563660).

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

20624820 is a wasteful number, since it uses less digits than its factorization.

20624820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624 (or 2622 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20624820 is about 4541.4557137552. The cubic root of 20624820 is about 274.2395298293.

The spelling of 20624820 in words is "twenty million, six hundred twenty-four thousand, eight hundred twenty".