20528420 has 48 divisors (see below), whose sum is σ = 49085568. Its totient is φ = 7138560.

The previous prime is 20528411. The next prime is 20528423. The reversal of 20528420 is 2482502.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (20528423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3032 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (1022616).

Almost surely, 2^20528420 is an apocalyptic number.

20528420 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 20528420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24542784).

20528420 is an abundant number, since it is smaller than the sum of its proper divisors (28557148).

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

20528420 is a wasteful number, since it uses less digits than its factorization.

20528420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100 (or 4098 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20528420 is about 4530.8299460474. The cubic root of 20528420 is about 273.8115990457.

The spelling of 20528420 in words is "twenty million, five hundred twenty-eight thousand, four hundred twenty".