20529920 has 72 divisors (see below), whose sum is σ = 50454096. Its totient is φ = 7999488.

The previous prime is 20529919. The next prime is 20529959. The reversal of 20529920 is 2992502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54854 + ... + 55226.

Almost surely, 2^20529920 is an apocalyptic number.

20529920 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 20529920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25227048).

20529920 is an abundant number, since it is smaller than the sum of its proper divisors (29924176).

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

20529920 is an equidigital number, since it uses as much as digits as its factorization.

20529920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 20529920 is about 4530.9954756102. The cubic root of 20529920 is about 273.8182679693.

The spelling of 20529920 in words is "twenty million, five hundred twenty-nine thousand, nine hundred twenty".