20648357 has 2 divisors, whose sum is σ = 20648358. Its totient is φ = 20648356.

The previous prime is 20648333. The next prime is 20648389. The reversal of 20648357 is 75384602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12348196 + 8300161 = 3514^2 + 2881^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648357 - 2¹⁴ = 20631973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20648057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324178 + 10324179.

It is an arithmetic number, because the mean of its divisors is an integer number (10324179).

Almost surely, 2^20648357 is an apocalyptic number.

It is an amenable number.

20648357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648357 is an equidigital number, since it uses as much as digits as its factorization.

20648357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20648357 is about 4544.0463245878. The cubic root of 20648357 is about 274.3438106905.

The spelling of 20648357 in words is "twenty million, six hundred forty-eight thousand, three hundred fifty-seven".