20010320 has 40 divisors (see below), whose sum is σ = 50755680. Its totient is φ = 7276160.

The previous prime is 20010313. The next prime is 20010323. The reversal of 20010320 is 2301002.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 20010298 and 20010307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010323) 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, 10490 + ... + 12249.

It is an arithmetic number, because the mean of its divisors is an integer number (1268892).

Almost surely, 2^20010320 is an apocalyptic number.

20010320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010320 is an abundant number, since it is smaller than the sum of its proper divisors (30745360).

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

20010320 is a wasteful number, since it uses less digits than its factorization.

20010320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22763 (or 22757 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 20010320 is about 4473.2896172727. The cubic root of 20010320 is about 271.4884416145.

Adding to 20010320 its reverse (2301002), we get a palindrome (22311322).

The spelling of 20010320 in words is "twenty million, ten thousand, three hundred twenty".