20121010 has 32 divisors (see below), whose sum is σ = 44577792. Its totient is φ = 6367680.

The previous prime is 20120999. The next prime is 20121043. The reversal of 20121010 is 1012102.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 20120984 and 20121002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10146 + ... + 11965.

It is an arithmetic number, because the mean of its divisors is an integer number (1393056).

Almost surely, 2^20121010 is an apocalyptic number.

20121010 is an abundant number, since it is smaller than the sum of its proper divisors (24456782).

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

20121010 is a wasteful number, since it uses less digits than its factorization.

20121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22138.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 20121010 is about 4485.6448811737. The cubic root of 20121010 is about 271.9881140279.

Adding to 20121010 its reverse (1012102), we get a palindrome (21133112).

The spelling of 20121010 in words is "twenty million, one hundred twenty-one thousand, ten".