20211320 has 16 divisors (see below), whose sum is σ = 45475560. Its totient is φ = 8084512.

The previous prime is 20211263. The next prime is 20211377. The reversal of 20211320 is 2311202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20211263) and next prime (20211377).

It is a super-2 number, since 2×20211320² = 816994912284800, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252602 + ... + 252681.

Almost surely, 2^20211320 is an apocalyptic number.

20211320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211320 is an abundant number, since it is smaller than the sum of its proper divisors (25264240).

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

20211320 is a wasteful number, since it uses less digits than its factorization.

20211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505294 (or 505290 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20211320 is about 4495.7001679382. The cubic root of 20211320 is about 272.3944320758.

Adding to 20211320 its reverse (2311202), we get a palindrome (22522522).

The spelling of 20211320 in words is "twenty million, two hundred eleven thousand, three hundred twenty".