20927720 has 32 divisors (see below), whose sum is σ = 51369120. Its totient is φ = 7609920.

The previous prime is 20927719. The next prime is 20927743. The reversal of 20927720 is 2772902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23342 + ... + 24221.

It is an arithmetic number, because the mean of its divisors is an integer number (1605285).

Almost surely, 2^20927720 is an apocalyptic number.

20927720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20927720 is an abundant number, since it is smaller than the sum of its proper divisors (30441400).

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

20927720 is a wasteful number, since it uses less digits than its factorization.

20927720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47585 (or 47581 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20927720 is about 4574.6825026443. The cubic root of 20927720 is about 275.5755219760.

The spelling of 20927720 in words is "twenty million, nine hundred twenty-seven thousand, seven hundred twenty".