20648501 has 2 divisors, whose sum is σ = 20648502. Its totient is φ = 20648500.

The previous prime is 20648477. The next prime is 20648527. The reversal of 20648501 is 10584602.

It is an a-pointer prime, because the next prime (20648527) can be obtained adding 20648501 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15007876 + 5640625 = 3874^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648501 - 2¹⁸ = 20386357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20648531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324250 + 10324251.

It is an arithmetic number, because the mean of its divisors is an integer number (10324251).

Almost surely, 2^20648501 is an apocalyptic number.

It is an amenable number.

20648501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648501 is an equidigital number, since it uses as much as digits as its factorization.

20648501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20648501 is about 4544.0621694691. The cubic root of 20648501 is about 274.3444484397.

The spelling of 20648501 in words is "twenty million, six hundred forty-eight thousand, five hundred one".