20797020 has 96 divisors (see below), whose sum is σ = 68140800. Its totient is φ = 5251392.

The previous prime is 20797013. The next prime is 20797033. The reversal of 20797020 is 2079702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9247 + ... + 11273.

It is an arithmetic number, because the mean of its divisors is an integer number (709800).

Almost surely, 2^20797020 is an apocalyptic number.

20797020 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 20797020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34070400).

20797020 is an abundant number, since it is smaller than the sum of its proper divisors (47343780).

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

20797020 is a wasteful number, since it uses less digits than its factorization.

20797020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064 (or 2056 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 20797020 is about 4560.3749845819. The cubic root of 20797020 is about 275.0006391170. Note that the first 3 decimals are identical.

The spelling of 20797020 in words is "twenty million, seven hundred ninety-seven thousand, twenty".