20260649 has 2 divisors, whose sum is σ = 20260650. Its totient is φ = 20260648.

The previous prime is 20260637. The next prime is 20260663. The reversal of 20260649 is 94606202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15745024 + 4515625 = 3968^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 20260649 - 2²⁴ = 3483433 is a prime.

It is equal to p_1286093 and since 20260649 and 1286093 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20260609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130324 + 10130325.

It is an arithmetic number, because the mean of its divisors is an integer number (10130325).

Almost surely, 2^20260649 is an apocalyptic number.

It is an amenable number.

20260649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20260649 is an equidigital number, since it uses as much as digits as its factorization.

20260649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20260649 is about 4501.1830667059. The cubic root of 20260649 is about 272.6158596068.

The spelling of 20260649 in words is "twenty million, two hundred sixty thousand, six hundred forty-nine".