20728141 has 8 divisors (see below), whose sum is σ = 24136704. Its totient is φ = 17431440.

The previous prime is 20728139. The next prime is 20728153. The reversal of 20728141 is 14182702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20728141 - 2¹ = 20728139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27565 + ... + 28306.

It is an arithmetic number, because the mean of its divisors is an integer number (3017088).

Almost surely, 2^20728141 is an apocalyptic number.

It is an amenable number.

20728141 is a deficient number, since it is larger than the sum of its proper divisors (3408563).

20728141 is an equidigital number, since it uses as much as digits as its factorization.

20728141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55931.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20728141 is about 4552.8168203871. The cubic root of 20728141 is about 274.6967058439.

The spelling of 20728141 in words is "twenty million, seven hundred twenty-eight thousand, one hundred forty-one".