20728862 has 64 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 7761600.

The previous prime is 20728859. The next prime is 20728891. The reversal of 20728862 is 26882702.

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, 309353 + ... + 309419.

It is an arithmetic number, because the mean of its divisors is an integer number (642600).

Almost surely, 2^20728862 is an apocalyptic number.

20728862 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20728862 is a deficient number, since it is larger than the sum of its proper divisors (20397538).

20728862 is a wasteful number, since it uses less digits than its factorization.

20728862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 20728862 is about 4552.8960014479. The cubic root of 20728862 is about 274.6998907899.

The spelling of 20728862 in words is "twenty million, seven hundred twenty-eight thousand, eight hundred sixty-two".