20761731072 has 168 divisors, whose sum is σ = 63135494760. Its totient is φ = 6555893760.

The previous prime is 20761731041. The next prime is 20761731101. The reversal of 20761731072 is 27013716702.

20761731072 is a `hidden beast` number, since 2 + 0 + 7 + 617 + 31 + 0 + 7 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1393422 + ... + 1408242.

Almost surely, 2^20761731072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20761731072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31567747380).

20761731072 is an abundant number, since it is smaller than the sum of its proper divisors (42373763688).

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

20761731072 is a wasteful number, since it uses less digits than its factorization.

20761731072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14872 (or 14845 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The spelling of 20761731072 in words is "twenty billion, seven hundred sixty-one million, seven hundred thirty-one thousand, seventy-two".