20529860 has 36 divisors (see below), whose sum is σ = 46594884. Its totient is φ = 7553280.

The previous prime is 20529851. The next prime is 20529881. The reversal of 20529860 is 6892502.

It can be written as a sum of positive squares in 6 ways, for example, as 153664 + 20376196 = 392^2 + 4514^2 .

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, 72920 + ... + 73200.

Almost surely, 2^20529860 is an apocalyptic number.

20529860 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 20529860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23297442).

20529860 is an abundant number, since it is smaller than the sum of its proper divisors (26065024).

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

20529860 is a wasteful number, since it uses less digits than its factorization.

20529860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20529860 is about 4530.9888545438. The cubic root of 20529860 is about 273.8180012186.

The spelling of 20529860 in words is "twenty million, five hundred twenty-nine thousand, eight hundred sixty".