20861926272 has 512 divisors, whose sum is σ = 70502400000. Its totient is φ = 6015098880.

The previous prime is 20861926231. The next prime is 20861926277. The reversal of 20861926272 is 27262916802.

20861926272 is a `hidden beast` number, since 2 + 0 + 8 + 6 + 19 + 2 + 627 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20861926277) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 140012854 + ... + 140013002.

It is an arithmetic number, because the mean of its divisors is an integer number (137700000).

Almost surely, 2^20861926272 is an apocalyptic number.

20861926272 is a gapful number since it is divisible by the number (22) 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 20861926272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35251200000).

20861926272 is an abundant number, since it is smaller than the sum of its proper divisors (49640473728).

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

20861926272 is a wasteful number, since it uses less digits than its factorization.

20861926272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 20861926272 in words is "twenty billion, eight hundred sixty-one million, nine hundred twenty-six thousand, two hundred seventy-two".