20728153 has 2 divisors, whose sum is σ = 20728154. Its totient is φ = 20728152.

The previous prime is 20728139. The next prime is 20728159. The reversal of 20728153 is 35182702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18731584 + 1996569 = 4328^2 + 1413^2 .

It is a cyclic number.

It is not a de Polignac number, because 20728153 - 2⁵ = 20728121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20728159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10364076 + 10364077.

It is an arithmetic number, because the mean of its divisors is an integer number (10364077).

Almost surely, 2^20728153 is an apocalyptic number.

It is an amenable number.

20728153 is a deficient number, since it is larger than the sum of its proper divisors (1).

20728153 is an equidigital number, since it uses as much as digits as its factorization.

20728153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20728153 is about 4552.8181382524. The cubic root of 20728153 is about 274.6967588533.

The spelling of 20728153 in words is "twenty million, seven hundred twenty-eight thousand, one hundred fifty-three".