20424072 has 64 divisors (see below), whose sum is σ = 54665280. Its totient is φ = 6336512.

The previous prime is 20424067. The next prime is 20424101. The reversal of 20424072 is 27042402.

It is a super-2 number, since 2×20424072² = 834285434122368, which contains 22 as substring.

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, 45883 + ... + 46325.

It is an arithmetic number, because the mean of its divisors is an integer number (854145).

Almost surely, 2^20424072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20424072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27332640).

20424072 is an abundant number, since it is smaller than the sum of its proper divisors (34241208).

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

20424072 is a wasteful number, since it uses less digits than its factorization.

20424072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 20424072 is about 4519.2999457881. The cubic root of 20424072 is about 273.3468735443.

Adding to 20424072 its reverse (27042402), we get a palindrome (47466474).

The spelling of 20424072 in words is "twenty million, four hundred twenty-four thousand, seventy-two".