20520431346040 has 32 divisors (see below), whose sum is σ = 46171123184880. Its totient is φ = 8208145399552.

The previous prime is 20520431346031. The next prime is 20520431346073. The reversal of 20520431346040 is 4064313402502.

It is a junction number, because it is equal to n+sod(n) for n = 20520431345987 and 20520431346005.

It is a congruent number.

It is an unprimeable number.

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, 15106764 + ... + 16408996.

Almost surely, 2^{20520431346040} is an apocalyptic number.

20520431346040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20520431346040 is an abundant number, since it is smaller than the sum of its proper divisors (25650691838840).

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

20520431346040 is a wasteful number, since it uses less digits than its factorization.

20520431346040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696191 (or 1696187 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

Adding to 20520431346040 its reverse (4064313402502), we get a palindrome (24584744748542).

The spelling of 20520431346040 in words is "twenty trillion, five hundred twenty billion, four hundred thirty-one million, three hundred forty-six thousand, forty".