20569956120 has 192 divisors, whose sum is σ = 78467987520. Its totient is φ = 4574610432.

The previous prime is 20569956119. The next prime is 20569956257. The reversal of 20569956120 is 2165996502.

It is a happy number.

20569956120 is a `hidden beast` number, since 2 + 0 + 5 + 69 + 9 + 561 + 20 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17067 + ... + 203546.

It is an arithmetic number, because the mean of its divisors is an integer number (408687435).

Almost surely, 2^20569956120 is an apocalyptic number.

20569956120 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 20569956120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39233993760).

20569956120 is an abundant number, since it is smaller than the sum of its proper divisors (57898031400).

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

20569956120 is a wasteful number, since it uses less digits than its factorization.

20569956120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220674 (or 220667 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 20569956120 in words is "twenty billion, five hundred sixty-nine million, nine hundred fifty-six thousand, one hundred twenty".