20561067 has 8 divisors (see below), whose sum is σ = 30460880. Its totient is φ = 13707360.

The previous prime is 20561053. The next prime is 20561069. The reversal of 20561067 is 76016502.

It is not a de Polignac number, because 20561067 - 2¹² = 20556971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 761521 = 20561067 / (2 + 0 + 5 + 6 + 1 + 0 + 6 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20561067.

It is not an unprimeable number, because it can be changed into a prime (20561069) 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, 380734 + ... + 380787.

It is an arithmetic number, because the mean of its divisors is an integer number (3807610).

Almost surely, 2^20561067 is an apocalyptic number.

20561067 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20561067 is a deficient number, since it is larger than the sum of its proper divisors (9899813).

20561067 is an equidigital number, since it uses as much as digits as its factorization.

20561067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761530 (or 761524 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20561067 is about 4534.4312763565. The cubic root of 20561067 is about 273.9566726027.

Adding to 20561067 its reverse (76016502), we get a palindrome (96577569).

The spelling of 20561067 in words is "twenty million, five hundred sixty-one thousand, sixty-seven".