20727720 has 192 divisors, whose sum is σ = 74954880. Its totient is φ = 4935168.

The previous prime is 20727701. The next prime is 20727757. The reversal of 20727720 is 2772702.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 201189 + ... + 201291.

It is an arithmetic number, because the mean of its divisors is an integer number (390390).

Almost surely, 2^20727720 is an apocalyptic number.

20727720 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 20727720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37477440).

20727720 is an abundant number, since it is smaller than the sum of its proper divisors (54227160).

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

20727720 is a wasteful number, since it uses less digits than its factorization.

20727720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 20727720 is about 4552.7705850394. The cubic root of 20727720 is about 274.6948460840.

The spelling of 20727720 in words is "twenty million, seven hundred twenty-seven thousand, seven hundred twenty".