20121104 has 10 divisors (see below), whose sum is σ = 38984670. Its totient is φ = 10060544.

The previous prime is 20121103. The next prime is 20121107. The reversal of 20121104 is 40112102.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 336400 = 4448^2 + 580^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628769 + ... + 628800.

It is an arithmetic number, because the mean of its divisors is an integer number (3898467).

Almost surely, 2^20121104 is an apocalyptic number.

It is an amenable number.

20121104 is a deficient number, since it is larger than the sum of its proper divisors (18863566).

20121104 is a wasteful number, since it uses less digits than its factorization.

20121104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257577 (or 1257571 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 20121104 is about 4485.6553590306. The cubic root of 20121104 is about 271.9885375792.

Adding to 20121104 its reverse (40112102), we get a palindrome (60233206).

The spelling of 20121104 in words is "twenty million, one hundred twenty-one thousand, one hundred four".