20720727 has 6 divisors (see below), whose sum is σ = 29929952. Its totient is φ = 13813812.

The previous prime is 20720719. The next prime is 20720731. The reversal of 20720727 is 72702702.

It is not a de Polignac number, because 20720727 - 2³ = 20720719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20720727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720717) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1151143 + ... + 1151160.

Almost surely, 2^20720727 is an apocalyptic number.

20720727 is a deficient number, since it is larger than the sum of its proper divisors (9209225).

20720727 is a wasteful number, since it uses less digits than its factorization.

20720727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302309 (or 2302306 counting only the distinct ones).

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

The square root of 20720727 is about 4552.0025263613. The cubic root of 20720727 is about 274.6639509490.

The spelling of 20720727 in words is "twenty million, seven hundred twenty thousand, seven hundred twenty-seven".