20547081 has 8 divisors (see below), whose sum is σ = 30440160. Its totient is φ = 13698036.

The previous prime is 20547053. The next prime is 20547083. The reversal of 20547081 is 18074502.

It is not a de Polignac number, because 20547081 - 2⁵ = 20547049 is a prime.

It is a super-2 number, since 2×20547081² = 844365075241122, which contains 22 as substring.

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: 761003 = 20547081 / (2 + 0 + 5 + 4 + 7 + 0 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (20547083) 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, 380475 + ... + 380528.

It is an arithmetic number, because the mean of its divisors is an integer number (3805020).

Almost surely, 2^20547081 is an apocalyptic number.

It is an amenable number.

20547081 is a deficient number, since it is larger than the sum of its proper divisors (9893079).

20547081 is an equidigital number, since it uses as much as digits as its factorization.

20547081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761012 (or 761006 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20547081 is about 4532.8888139905. Note that the first 4 decimals coincide. The cubic root of 20547081 is about 273.8945417948.

The spelling of 20547081 in words is "twenty million, five hundred forty-seven thousand, eighty-one".