20728162 has 16 divisors (see below), whose sum is σ = 38267712. Its totient is φ = 8200080.

The previous prime is 20728159. The next prime is 20728199. The reversal of 20728162 is 26182702.

It is a self number, because there is not a number n which added to its sum of digits gives 20728162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56764 + ... + 57127.

It is an arithmetic number, because the mean of its divisors is an integer number (2391732).

Almost surely, 2^20728162 is an apocalyptic number.

20728162 is a deficient number, since it is larger than the sum of its proper divisors (17539550).

20728162 is a wasteful number, since it uses less digits than its factorization.

20728162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113913.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20728162 is about 4552.8191266511. The cubic root of 20728162 is about 274.6967986104.

It can be divided in two parts, 20728 and 162, that multiplied together give a triangular number (3357936 = T₂₅₉₁).

The spelling of 20728162 in words is "twenty million, seven hundred twenty-eight thousand, one hundred sixty-two".