20211030 has 72 divisors (see below), whose sum is σ = 61141392. Its totient is φ = 4618656.

The previous prime is 20211007. The next prime is 20211031. The reversal of 20211030 is 3011202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211031) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2119 + ... + 6701.

It is an arithmetic number, because the mean of its divisors is an integer number (849186).

Almost surely, 2^20211030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30570696).

20211030 is an abundant number, since it is smaller than the sum of its proper divisors (40930362).

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

20211030 is a wasteful number, since it uses less digits than its factorization.

20211030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4610 (or 4600 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20211030 is about 4495.6679147820. The cubic root of 20211030 is about 272.3931292619.

Adding to 20211030 its reverse (3011202), we get a palindrome (23222232).

The spelling of 20211030 in words is "twenty million, two hundred eleven thousand, thirty".