20321010 has 64 divisors (see below), whose sum is σ = 54984960. Its totient is φ = 5339520.

The previous prime is 20321009. The next prime is 20321011. The reversal of 20321010 is 1012302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20321009) and next prime (20321011).

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

It is a junction number, because it is equal to n+sod(n) for n = 20320983 and 20321001.

It is not an unprimeable number, because it can be changed into a prime (20321011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19195 + ... + 20225.

It is an arithmetic number, because the mean of its divisors is an integer number (859140).

Almost surely, 2^20321010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20321010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27492480).

20321010 is an abundant number, since it is smaller than the sum of its proper divisors (34663950).

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

20321010 is a wasteful number, since it uses less digits than its factorization.

20321010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120 (or 1114 counting only the distinct ones).

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

The square root of 20321010 is about 4507.8830952011. The cubic root of 20321010 is about 272.8863190491.

Adding to 20321010 its reverse (1012302), we get a palindrome (21333312).

The spelling of 20321010 in words is "twenty million, three hundred twenty-one thousand, ten".