20728254 has 32 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 6744992.

The previous prime is 20728249. The next prime is 20728271. The reversal of 20728254 is 45282702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53092 + ... + 53480.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^20728254 is an apocalyptic number.

20728254 is an abundant number, since it is smaller than the sum of its proper divisors (21728706).

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

20728254 is a wasteful number, since it uses less digits than its factorization.

20728254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20728254 is about 4552.8292302699. The cubic root of 20728254 is about 274.6972050151.

The spelling of 20728254 in words is "twenty million, seven hundred twenty-eight thousand, two hundred fifty-four".