20522040 has 128 divisors (see below), whose sum is σ = 76792320. Its totient is φ = 4262400.

The previous prime is 20522039. The next prime is 20522041. The reversal of 20522040 is 4022502.

It is an interprime number because it is at equal distance from previous prime (20522039) and next prime (20522041).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20522041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8130 + ... + 10350.

It is an arithmetic number, because the mean of its divisors is an integer number (599940).

Almost surely, 2^20522040 is an apocalyptic number.

20522040 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 20522040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38396160).

20522040 is an abundant number, since it is smaller than the sum of its proper divisors (56270280).

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

20522040 is a wasteful number, since it uses less digits than its factorization.

20522040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253 (or 2249 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20522040 is about 4530.1258260671. The cubic root of 20522040 is about 273.7832302606.

Adding to 20522040 its reverse (4022502), we get a palindrome (24544542).

The spelling of 20522040 in words is "twenty million, five hundred twenty-two thousand, forty".