20828057 has 2 divisors, whose sum is σ = 20828058. Its totient is φ = 20828056.

The previous prime is 20828053. The next prime is 20828107. The reversal of 20828057 is 75082802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14622976 + 6205081 = 3824^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 20828057 - 2² = 20828053 is a prime.

It is not a weakly prime, because it can be changed into another prime (20828053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10414028 + 10414029.

It is an arithmetic number, because the mean of its divisors is an integer number (10414029).

Almost surely, 2^20828057 is an apocalyptic number.

It is an amenable number.

20828057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20828057 is an equidigital number, since it uses as much as digits as its factorization.

20828057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 20828057 is about 4563.7766159180. The cubic root of 20828057 is about 275.1373726881.

The spelling of 20828057 in words is "twenty million, eight hundred twenty-eight thousand, fifty-seven".