20249520 has 80 divisors (see below), whose sum is σ = 63329280. Its totient is φ = 5352192.

The previous prime is 20249519. The next prime is 20249539. The reversal of 20249520 is 2594202.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33057 + ... + 33663.

It is an arithmetic number, because the mean of its divisors is an integer number (791616).

Almost surely, 2^20249520 is an apocalyptic number.

20249520 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 20249520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31664640).

20249520 is an abundant number, since it is smaller than the sum of its proper divisors (43079760).

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

20249520 is a wasteful number, since it uses less digits than its factorization.

20249520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762 (or 756 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20249520 is about 4499.9466663506. The cubic root of 20249520 is about 272.5659352834.

The spelling of 20249520 in words is "twenty million, two hundred forty-nine thousand, five hundred twenty".