20650388 has 24 divisors (see below), whose sum is σ = 40388544. Its totient is φ = 9156800.

The previous prime is 20650387. The next prime is 20650423. The reversal of 20650388 is 88305602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3920 + ... + 7527.

It is an arithmetic number, because the mean of its divisors is an integer number (1682856).

Almost surely, 2^20650388 is an apocalyptic number.

It is an amenable number.

20650388 is a deficient number, since it is larger than the sum of its proper divisors (19738156).

20650388 is a wasteful number, since it uses less digits than its factorization.

20650388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11503 (or 11501 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20650388 is about 4544.2697983284. The cubic root of 20650388 is about 274.3528053369.

The spelling of 20650388 in words is "twenty million, six hundred fifty thousand, three hundred eighty-eight".