20412123440 has 40 divisors (see below), whose sum is σ = 47661913728. Its totient is φ = 8129799680.

The previous prime is 20412123437. The next prime is 20412123449. The reversal of 20412123440 is 4432121402.

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

It is not an unprimeable number, because it can be changed into a prime (20412123449) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 528896 + ... + 566175.

Almost surely, 2^20412123440 is an apocalyptic number.

20412123440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20412123440 is an abundant number, since it is smaller than the sum of its proper divisors (27249790288).

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

20412123440 is a wasteful number, since it uses less digits than its factorization.

20412123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095317 (or 1095311 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 20412123440 its reverse (4432121402), we get a palindrome (24844244842).

The spelling of 20412123440 in words is "twenty billion, four hundred twelve million, one hundred twenty-three thousand, four hundred forty".