20120681 has 8 divisors (see below), whose sum is σ = 23034624. Its totient is φ = 17216640.

The previous prime is 20120657. The next prime is 20120713. The reversal of 20120681 is 18602102.

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

It is not a de Polignac number, because 20120681 - 2¹⁸ = 19858537 is a prime.

It is a super-2 number, since 2×20120681² = 809683607807522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20120641) 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, 2576 + ... + 6846.

It is an arithmetic number, because the mean of its divisors is an integer number (2879328).

Almost surely, 2^20120681 is an apocalyptic number.

It is an amenable number.

20120681 is a deficient number, since it is larger than the sum of its proper divisors (2913943).

20120681 is an equidigital number, since it uses as much as digits as its factorization.

20120681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4951.

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

The square root of 20120681 is about 4485.6082084819. The cubic root of 20120681 is about 271.9866315878.

Adding to 20120681 its reverse (18602102), we get a palindrome (38722783).

The spelling of 20120681 in words is "twenty million, one hundred twenty thousand, six hundred eighty-one".