20728154 has 4 divisors (see below), whose sum is σ = 31092234. Its totient is φ = 10364076.

The previous prime is 20728153. The next prime is 20728159. The reversal of 20728154 is 45182702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10660225 + 10067929 = 3265^2 + 3173^2 .

It is not an unprimeable number, because it can be changed into a prime (20728153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5182037 + ... + 5182040.

Almost surely, 2^20728154 is an apocalyptic number.

20728154 is a deficient number, since it is larger than the sum of its proper divisors (10364080).

20728154 is a wasteful number, since it uses less digits than its factorization.

20728154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10364079.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20728154 is about 4552.8182480745. The cubic root of 20728154 is about 274.6967632708.

The spelling of 20728154 in words is "twenty million, seven hundred twenty-eight thousand, one hundred fifty-four".