20230640 has 40 divisors (see below), whose sum is σ = 48138288. Its totient is φ = 7902720.

The previous prime is 20230621. The next prime is 20230643. The reversal of 20230640 is 4603202.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20230643) 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, 500 + ... + 6380.

Almost surely, 2^20230640 is an apocalyptic number.

20230640 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 20230640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24069144).

20230640 is an abundant number, since it is smaller than the sum of its proper divisors (27907648).

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

20230640 is a wasteful number, since it uses less digits than its factorization.

20230640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5937 (or 5931 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20230640 is about 4497.8483745009. The cubic root of 20230640 is about 272.4811983773.

Adding to 20230640 its reverse (4603202), we get a palindrome (24833842).

The spelling of 20230640 in words is "twenty million, two hundred thirty thousand, six hundred forty".