20012681 has 8 divisors (see below), whose sum is σ = 22686720. Its totient is φ = 17500752.

The previous prime is 20012609. The next prime is 20012683. The reversal of 20012681 is 18621002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20012681 - 2¹⁰ = 20011657 is a prime.

It is a super-2 number, since 2×20012681² = 801014801615522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012683) 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, 40265 + ... + 40758.

It is an arithmetic number, because the mean of its divisors is an integer number (2835840).

Almost surely, 2^20012681 is an apocalyptic number.

It is an amenable number.

20012681 is a deficient number, since it is larger than the sum of its proper divisors (2674039).

20012681 is a wasteful number, since it uses less digits than its factorization.

20012681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81055.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 20012681 is about 4473.5535092363. The cubic root of 20012681 is about 271.4991187551.

Adding to 20012681 its reverse (18621002), we get a palindrome (38633683).

The spelling of 20012681 in words is "twenty million, twelve thousand, six hundred eighty-one".