20938388 has 6 divisors (see below), whose sum is σ = 36642186. Its totient is φ = 10469192.

The previous prime is 20938387. The next prime is 20938403. The reversal of 20938388 is 88383902.

It can be written as a sum of positive squares in only one way, i.e., 10876804 + 10061584 = 3298^2 + 3172^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20938387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2617295 + ... + 2617302.

It is an arithmetic number, because the mean of its divisors is an integer number (6107031).

Almost surely, 2^20938388 is an apocalyptic number.

It is an amenable number.

20938388 is a deficient number, since it is larger than the sum of its proper divisors (15703798).

20938388 is a wasteful number, since it uses less digits than its factorization.

20938388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5234601 (or 5234599 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 20938388 is about 4575.8483366475. The cubic root of 20938388 is about 275.6223393117.

The spelling of 20938388 in words is "twenty million, nine hundred thirty-eight thousand, three hundred eighty-eight".