20924040 has 32 divisors (see below), whose sum is σ = 62772480. Its totient is φ = 5579712.

The previous prime is 20924021. The next prime is 20924047. The reversal of 20924040 is 4042902.

It is a junction number, because it is equal to n+sod(n) for n = 20923998 and 20924016.

It is not an unprimeable number, because it can be changed into a prime (20924047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87064 + ... + 87303.

It is an arithmetic number, because the mean of its divisors is an integer number (1961640).

Almost surely, 2^20924040 is an apocalyptic number.

20924040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20924040 is an abundant number, since it is smaller than the sum of its proper divisors (41848440).

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

20924040 is a wasteful number, since it uses less digits than its factorization.

20924040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174381 (or 174377 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20924040 is about 4574.2802712558. The cubic root of 20924040 is about 275.5593683232.

Adding to 20924040 its reverse (4042902), we get a palindrome (24966942).

The spelling of 20924040 in words is "twenty million, nine hundred twenty-four thousand, forty".