20461556340 has 96 divisors (see below), whose sum is σ = 63739388160. Its totient is φ = 5449454208.

The previous prime is 20461556333. The next prime is 20461556351. The reversal of 20461556340 is 4365516402.

20461556340 is a `hidden beast` number, since 2 + 0 + 4 + 6 + 15 + 5 + 634 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20461556295 and 20461556304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 406609 + ... + 454151.

It is an arithmetic number, because the mean of its divisors is an integer number (663951960).

Almost surely, 2^20461556340 is an apocalyptic number.

20461556340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20461556340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31869694080).

20461556340 is an abundant number, since it is smaller than the sum of its proper divisors (43277831820).

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

20461556340 is a wasteful number, since it uses less digits than its factorization.

20461556340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48358 (or 48350 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 20461556340 in words is "twenty billion, four hundred sixty-one million, five hundred fifty-six thousand, three hundred forty".