20420532232440 has 32 divisors (see below), whose sum is σ = 61261596697680. Its totient is φ = 5445475261952.

The previous prime is 20420532232439. The next prime is 20420532232453. The reversal of 20420532232440 is 4423223502402.

It is a super-2 number, since 2×20420532232440² (a number of 27 digits) contains 22 as substring.

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, 85085550849 + ... + 85085551088.

Almost surely, 2^{20420532232440} is an apocalyptic number.

20420532232440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20420532232440 is an abundant number, since it is smaller than the sum of its proper divisors (40841064465240).

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

20420532232440 is a wasteful number, since it uses less digits than its factorization.

20420532232440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170171101951 (or 170171101947 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 33.

Adding to 20420532232440 its reverse (4423223502402), we get a palindrome (24843755734842).

The spelling of 20420532232440 in words is "twenty trillion, four hundred twenty billion, five hundred thirty-two million, two hundred thirty-two thousand, four hundred forty".