20461865 has 8 divisors (see below), whose sum is σ = 24615360. Its totient is φ = 16328752.

The previous prime is 20461853. The next prime is 20461913. The reversal of 20461865 is 56816402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20461865 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2789 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (3076920).

Almost surely, 2^20461865 is an apocalyptic number.

It is an amenable number.

20461865 is a deficient number, since it is larger than the sum of its proper divisors (4153495).

20461865 is an equidigital number, since it uses as much as digits as its factorization.

20461865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10191.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20461865 is about 4523.4793024839. The cubic root of 20461865 is about 273.5153713341.

The spelling of 20461865 in words is "twenty million, four hundred sixty-one thousand, eight hundred sixty-five".