20121244040 has 32 divisors (see below), whose sum is σ = 45892981080. Its totient is φ = 7938243072.

The previous prime is 20121244027. The next prime is 20121244061. The reversal of 20121244040 is 4044212102.

It can be written as a sum of positive squares in 4 ways, for example, as 17334882244 + 2786361796 = 131662^2 + 52786^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3442499 + ... + 3448338.

Almost surely, 2^20121244040 is an apocalyptic number.

20121244040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121244040 is an abundant number, since it is smaller than the sum of its proper divisors (25771737040).

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

20121244040 is a wasteful number, since it uses less digits than its factorization.

20121244040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6890921 (or 6890917 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20121244040 its reverse (4044212102), we get a palindrome (24165456142).

The spelling of 20121244040 in words is "twenty billion, one hundred twenty-one million, two hundred forty-four thousand, forty".