20281838 has 8 divisors (see below), whose sum is σ = 30877032. Its totient is φ = 9989496.

The previous prime is 20281823. The next prime is 20281841. The reversal of 20281838 is 83818202.

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

It is a super-2 number, since 2×20281838² = 822705905316488, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75545 + ... + 75812.

It is an arithmetic number, because the mean of its divisors is an integer number (3859629).

Almost surely, 2^20281838 is an apocalyptic number.

20281838 is a deficient number, since it is larger than the sum of its proper divisors (10595194).

20281838 is a wasteful number, since it uses less digits than its factorization.

20281838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151426.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 20281838 is about 4503.5361661699. The cubic root of 20281838 is about 272.7108622382.

The spelling of 20281838 in words is "twenty million, two hundred eighty-one thousand, eight hundred thirty-eight".