20607081 has 32 divisors (see below), whose sum is σ = 31605120. Its totient is φ = 11827200.

The previous prime is 20607073. The next prime is 20607109. The reversal of 20607081 is 18070602.

It is not a de Polignac number, because 20607081 - 2³ = 20607073 is a prime.

It is a super-2 number, since 2×20607081² = 849303574681122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20607061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58201 + ... + 58553.

It is an arithmetic number, because the mean of its divisors is an integer number (987660).

Almost surely, 2^20607081 is an apocalyptic number.

It is an amenable number.

20607081 is a deficient number, since it is larger than the sum of its proper divisors (10998039).

20607081 is a wasteful number, since it uses less digits than its factorization.

20607081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20607081 is about 4539.5022854934. The cubic root of 20607081 is about 274.1608846116.

Adding to 20607081 its reverse (18070602), we get a palindrome (38677683).

The spelling of 20607081 in words is "twenty million, six hundred seven thousand, eighty-one".