20938590 has 48 divisors (see below), whose sum is σ = 55203408. Its totient is φ = 5505408.

The previous prime is 20938583. The next prime is 20938597. The reversal of 20938590 is 9583902.

It is an interprime number because it is at equal distance from previous prime (20938583) and next prime (20938597).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20938597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4977 + ... + 8163.

It is an arithmetic number, because the mean of its divisors is an integer number (1150071).

Almost surely, 2^20938590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20938590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27601704).

20938590 is an abundant number, since it is smaller than the sum of its proper divisors (34264818).

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

20938590 is a wasteful number, since it uses less digits than its factorization.

20938590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273 (or 3270 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20938590 is about 4575.8704090042. The cubic root of 20938590 is about 275.6232256507.

It can be divided in two parts, 20938 and 590, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 20938590 in words is "twenty million, nine hundred thirty-eight thousand, five hundred ninety".