20022540 has 48 divisors (see below), whose sum is σ = 56297472. Its totient is φ = 5317056.

The previous prime is 20022529. The next prime is 20022547. The reversal of 20022540 is 4522002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (20022547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17877 + ... + 18963.

It is an arithmetic number, because the mean of its divisors is an integer number (1172864).

Almost surely, 2^20022540 is an apocalyptic number.

20022540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20022540 is an abundant number, since it is smaller than the sum of its proper divisors (36274932).

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

20022540 is a wasteful number, since it uses less digits than its factorization.

20022540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406 (or 1404 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20022540 is about 4474.6552939863. The cubic root of 20022540 is about 271.5436949979.

Adding to 20022540 its reverse (4522002), we get a palindrome (24544542).

The spelling of 20022540 in words is "twenty million, twenty-two thousand, five hundred forty".