20461856 has 12 divisors (see below), whose sum is σ = 40284342. Its totient is φ = 10230912.

The previous prime is 20461853. The next prime is 20461913. The reversal of 20461856 is 65816402.

It can be written as a sum of positive squares in only one way, i.e., 20394256 + 67600 = 4516^2 + 260^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 639433 = 20461856 / (2 + 0 + 4 + 6 + 1 + 8 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (20461853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319685 + ... + 319748.

Almost surely, 2^20461856 is an apocalyptic number.

It is an amenable number.

20461856 is a deficient number, since it is larger than the sum of its proper divisors (19822486).

20461856 is an equidigital number, since it uses as much as digits as its factorization.

20461856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639443 (or 639435 counting only the distinct ones).

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

The square root of 20461856 is about 4523.4783076743. The cubic root of 20461856 is about 273.5153312329.

The spelling of 20461856 in words is "twenty million, four hundred sixty-one thousand, eight hundred fifty-six".