20241640 has 32 divisors (see below), whose sum is σ = 45672480. Its totient is φ = 8073792.

The previous prime is 20241619. The next prime is 20241653. The reversal of 20241640 is 4614202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25327 + ... + 26113.

It is an arithmetic number, because the mean of its divisors is an integer number (1427265).

Almost surely, 2^20241640 is an apocalyptic number.

20241640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20241640 is an abundant number, since it is smaller than the sum of its proper divisors (25430840).

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

20241640 is a wasteful number, since it uses less digits than its factorization.

20241640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441 (or 1437 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20241640 is about 4499.0710152208. The cubic root of 20241640 is about 272.5305748035.

Adding to 20241640 its reverse (4614202), we get a palindrome (24855842).

The spelling of 20241640 in words is "twenty million, two hundred forty-one thousand, six hundred forty".