20235138 has 48 divisors (see below), whose sum is σ = 51365664. Its totient is φ = 5255040.

The previous prime is 20235121. The next prime is 20235143. The reversal of 20235138 is 83153202.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106 + ... + 6362.

It is an arithmetic number, because the mean of its divisors is an integer number (1070118).

Almost surely, 2^20235138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20235138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25682832).

20235138 is an abundant number, since it is smaller than the sum of its proper divisors (31130526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20235138 is a wasteful number, since it uses less digits than its factorization.

20235138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6287 (or 6280 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20235138 is about 4498.3483635663. The cubic root of 20235138 is about 272.5013910094.

The spelling of 20235138 in words is "twenty million, two hundred thirty-five thousand, one hundred thirty-eight".