20422530 has 80 divisors (see below), whose sum is σ = 57847680. Its totient is φ = 5155488.

The previous prime is 20422517. The next prime is 20422579. The reversal of 20422530 is 3522402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14727 + ... + 16053.

It is an arithmetic number, because the mean of its divisors is an integer number (723096).

Almost surely, 2^20422530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20422530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28923840).

20422530 is an abundant number, since it is smaller than the sum of its proper divisors (37425150).

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

20422530 is a wasteful number, since it uses less digits than its factorization.

20422530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20422530 is about 4519.1293409240. The cubic root of 20422530 is about 273.3399942193.

Adding to 20422530 its reverse (3522402), we get a palindrome (23944932).

It can be divided in two parts, 204225 and 30, that multiplied together give a triangular number (6126750 = T₃₅₀₀).

The spelling of 20422530 in words is "twenty million, four hundred twenty-two thousand, five hundred thirty".