20312206040 has 32 divisors (see below), whose sum is σ = 52231387680. Its totient is φ = 6964184832.

The previous prime is 20312206027. The next prime is 20312206049. The reversal of 20312206040 is 4060221302.

It is a super-2 number, since 2×20312206040² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312206049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36271517 + ... + 36272076.

It is an arithmetic number, because the mean of its divisors is an integer number (1632230865).

Almost surely, 2^20312206040 is an apocalyptic number.

20312206040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312206040 is an abundant number, since it is smaller than the sum of its proper divisors (31919181640).

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

20312206040 is a wasteful number, since it uses less digits than its factorization.

20312206040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72543611 (or 72543607 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20312206040 its reverse (4060221302), we get a palindrome (24372427342).

The spelling of 20312206040 in words is "twenty billion, three hundred twelve million, two hundred six thousand, forty".