20757028 has 12 divisors (see below), whose sum is σ = 36368640. Its totient is φ = 10365992.

The previous prime is 20757001. The next prime is 20757031. The reversal of 20757028 is 82075702.

It is a super-2 number, since 2×20757028² = 861708422785568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1293 + ... + 6571.

It is an arithmetic number, because the mean of its divisors is an integer number (3030720).

Almost surely, 2^20757028 is an apocalyptic number.

It is an amenable number.

20757028 is a deficient number, since it is larger than the sum of its proper divisors (15611612).

20757028 is a wasteful number, since it uses less digits than its factorization.

20757028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6266 (or 6264 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 20757028 is about 4555.9881474824. The cubic root of 20757028 is about 274.8242535485.

The spelling of 20757028 in words is "twenty million, seven hundred fifty-seven thousand, twenty-eight".