20340881 has 4 divisors (see below), whose sum is σ = 22190064. Its totient is φ = 18491700.

The previous prime is 20340871. The next prime is 20340907. The reversal of 20340881 is 18804302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20340881 - 2¹⁰ = 20339857 is a prime.

It is a super-2 number, since 2×20340881² = 827502879712322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20340881.

It is not an unprimeable number, because it can be changed into a prime (20340871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 924575 + ... + 924596.

It is an arithmetic number, because the mean of its divisors is an integer number (5547516).

Almost surely, 2^20340881 is an apocalyptic number.

It is an amenable number.

20340881 is a deficient number, since it is larger than the sum of its proper divisors (1849183).

20340881 is a wasteful number, since it uses less digits than its factorization.

20340881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849182.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20340881 is about 4510.0865845347. The cubic root of 20340881 is about 272.9752378172.

The spelling of 20340881 in words is "twenty million, three hundred forty thousand, eight hundred eighty-one".