20531303340 has 48 divisors (see below), whose sum is σ = 57647842560. Its totient is φ = 5459757760.

The previous prime is 20531303297. The next prime is 20531303341. The reversal of 20531303340 is 4330313502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20531303340.

It is not an unprimeable number, because it can be changed into a prime (20531303341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455046 + ... + 498125.

It is an arithmetic number, because the mean of its divisors is an integer number (1200996720).

Almost surely, 2^20531303340 is an apocalyptic number.

20531303340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20531303340 is an abundant number, since it is smaller than the sum of its proper divisors (37116539220).

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

20531303340 is a wasteful number, since it uses less digits than its factorization.

20531303340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953542 (or 953540 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 24.

Adding to 20531303340 its reverse (4330313502), we get a palindrome (24861616842).

The spelling of 20531303340 in words is "twenty billion, five hundred thirty-one million, three hundred three thousand, three hundred forty".