20358140 has 96 divisors (see below), whose sum is σ = 49871808. Its totient is φ = 6912000.

The previous prime is 20358137. The next prime is 20358161. The reversal of 20358140 is 4185302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 333710 + ... + 333770.

It is an arithmetic number, because the mean of its divisors is an integer number (519498).

Almost surely, 2^20358140 is an apocalyptic number.

20358140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20358140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24935904).

20358140 is an abundant number, since it is smaller than the sum of its proper divisors (29513668).

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

20358140 is a wasteful number, since it uses less digits than its factorization.

20358140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20358140 is about 4511.9995567376. Note that the first 3 decimals coincide. The cubic root of 20358140 is about 273.0524214254.

It can be divided in two parts, 2035 and 8140, that multiplied together give a square (16564900 = 4070²).

The spelling of 20358140 in words is "twenty million, three hundred fifty-eight thousand, one hundred forty".