20856528 has 300 divisors, whose sum is σ = 79821280. Its totient is φ = 5132160.

The previous prime is 20856491. The next prime is 20856541. The reversal of 20856528 is 82565802.

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

It is a junction number, because it is equal to n+sod(n) for n = 20856492 and 20856501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1097703 + ... + 1097721.

Almost surely, 2^20856528 is an apocalyptic number.

20856528 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 20856528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39910640).

20856528 is an abundant number, since it is smaller than the sum of its proper divisors (58964752).

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

20856528 is a wasteful number, since it uses less digits than its factorization.

20856528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 20856528 is about 4566.8947874896. The cubic root of 20856528 is about 275.2626823370.

The spelling of 20856528 in words is "twenty million, eight hundred fifty-six thousand, five hundred twenty-eight".