20383881 has 16 divisors (see below), whose sum is σ = 31309824. Its totient is φ = 11554704.

The previous prime is 20383877. The next prime is 20383907. The reversal of 20383881 is 18838302.

It is not a de Polignac number, because 20383881 - 2² = 20383877 is a prime.

It is a super-2 number, since 2×20383881² = 831005209244322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20383801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1155 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (1956864).

Almost surely, 2^20383881 is an apocalyptic number.

20383881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20383881 is a deficient number, since it is larger than the sum of its proper divisors (10925943).

20383881 is a wasteful number, since it uses less digits than its factorization.

20383881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20383881 is about 4514.8511603374. The cubic root of 20383881 is about 273.1674561994.

The spelling of 20383881 in words is "twenty million, three hundred eighty-three thousand, eight hundred eighty-one".