20861337830220 has 240 divisors, whose sum is σ = 68828456809728. Its totient is φ = 5281993566720.

The previous prime is 20861337830213. The next prime is 20861337830261. The reversal of 20861337830220 is 2203873316802.

20861337830220 is a `hidden beast` number, since 2 + 0 + 8 + 6 + 1 + 337 + 8 + 302 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 79 ways as a sum of consecutive naturals, for example, 1257199 + ... + 6580518.

Almost surely, 2^{20861337830220} is an apocalyptic number.

20861337830220 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 20861337830220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34414228404864).

20861337830220 is an abundant number, since it is smaller than the sum of its proper divisors (47967118979508).

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

20861337830220 is a wasteful number, since it uses less digits than its factorization.

20861337830220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7837822 (or 7837811 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 20861337830220 in words is "twenty trillion, eight hundred sixty-one billion, three hundred thirty-seven million, eight hundred thirty thousand, two hundred twenty".