20523621888 has 400 divisors, whose sum is σ = 76385003904. Its totient is φ = 5329981440.

The previous prime is 20523621857. The next prime is 20523621931. The reversal of 20523621888 is 88812632502.

20523621888 is a `hidden beast` number, since 20 + 523 + 6 + 21 + 8 + 88 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3190131 + ... + 3196557.

Almost surely, 2^20523621888 is an apocalyptic number.

20523621888 is a gapful number since it is divisible by the number (28) 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 20523621888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38192501952).

20523621888 is an abundant number, since it is smaller than the sum of its proper divisors (55861382016).

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

20523621888 is an equidigital number, since it uses as much as digits as its factorization.

20523621888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6475 (or 6450 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

It can be divided in two parts, 20523 and 621888, that added together give a triangular number (642411 = T₁₁₃₃).

The spelling of 20523621888 in words is "twenty billion, five hundred twenty-three million, six hundred twenty-one thousand, eight hundred eighty-eight".