20649303865 has 8 divisors (see below), whose sum is σ = 24779942208. Its totient is φ = 16518924720.

The previous prime is 20649303863. The next prime is 20649303889. The reversal of 20649303865 is 56830394602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20649303865 - 2¹ = 20649303863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20649303863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245970 + ... + 319060.

It is an arithmetic number, because the mean of its divisors is an integer number (3097492776).

Almost surely, 2^20649303865 is an apocalyptic number.

It is an amenable number.

20649303865 is a deficient number, since it is larger than the sum of its proper divisors (4130638343).

20649303865 is an equidigital number, since it uses as much as digits as its factorization.

20649303865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129599.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 20649303865 in words is "twenty billion, six hundred forty-nine million, three hundred three thousand, eight hundred sixty-five".