20662371 has 20 divisors (see below), whose sum is σ = 31266400. Its totient is φ = 13596336.

The previous prime is 20662357. The next prime is 20662381. The reversal of 20662371 is 17326602.

It is a happy number.

It is not a de Polignac number, because 20662371 - 2⁶ = 20662307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20662351) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4785 + ... + 8013.

It is an arithmetic number, because the mean of its divisors is an integer number (1563320).

Almost surely, 2^20662371 is an apocalyptic number.

20662371 is a deficient number, since it is larger than the sum of its proper divisors (10604029).

20662371 is an equidigital number, since it uses as much as digits as its factorization.

20662371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320 (or 3311 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20662371 is about 4545.5880807658. The cubic root of 20662371 is about 274.4058621926.

Adding to 20662371 its reverse (17326602), we get a palindrome (37988973).

The spelling of 20662371 in words is "twenty million, six hundred sixty-two thousand, three hundred seventy-one".