20160561 has 16 divisors (see below), whose sum is σ = 27998208. Its totient is φ = 12892800.

The previous prime is 20160541. The next prime is 20160583. The reversal of 20160561 is 16506102.

It is a happy number.

It is not a de Polignac number, because 20160561 - 2⁵ = 20160529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20160541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6160 + ... + 8846.

It is an arithmetic number, because the mean of its divisors is an integer number (1749888).

Almost surely, 2^20160561 is an apocalyptic number.

It is an amenable number.

20160561 is a deficient number, since it is larger than the sum of its proper divisors (7837647).

20160561 is a wasteful number, since it uses less digits than its factorization.

20160561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20160561 is about 4490.0513360094. The cubic root of 20160561 is about 272.1662091489.

Adding to 20160561 its reverse (16506102), we get a palindrome (36666663).

The spelling of 20160561 in words is "twenty million, one hundred sixty thousand, five hundred sixty-one".