20454649 has 2 divisors, whose sum is σ = 20454650. Its totient is φ = 20454648.

The previous prime is 20454647. The next prime is 20454653. The reversal of 20454649 is 94645402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18550249 + 1904400 = 4307^2 + 1380^2 .

It is a cyclic number.

It is not a de Polignac number, because 20454649 - 2¹ = 20454647 is a prime.

Together with 20454647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20454641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227324 + 10227325.

It is an arithmetic number, because the mean of its divisors is an integer number (10227325).

Almost surely, 2^20454649 is an apocalyptic number.

It is an amenable number.

20454649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20454649 is an equidigital number, since it uses as much as digits as its factorization.

20454649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 20454649 is about 4522.6816160327. The cubic root of 20454649 is about 273.4832152725.

It can be divided in two parts, 20 and 454649, that multiplied together give a triangular number (9092980 = T₄₂₆₄).

The spelling of 20454649 in words is "twenty million, four hundred fifty-four thousand, six hundred forty-nine".