20951238 has 64 divisors (see below), whose sum is σ = 52876800. Its totient is φ = 5376000.

The previous prime is 20951233. The next prime is 20951239. The reversal of 20951238 is 83215902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20951233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46438 + ... + 46886.

It is an arithmetic number, because the mean of its divisors is an integer number (826200).

Almost surely, 2^20951238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20951238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26438400).

20951238 is an abundant number, since it is smaller than the sum of its proper divisors (31925562).

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

20951238 is a wasteful number, since it uses less digits than its factorization.

20951238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20951238 is about 4577.2522325081. The cubic root of 20951238 is about 275.6787114128.

It can be divided in two parts, 2095 and 1238, that added together give a palindrome (3333).

The spelling of 20951238 in words is "twenty million, nine hundred fifty-one thousand, two hundred thirty-eight".