20069440 has 56 divisors (see below), whose sum is σ = 48646080. Its totient is φ = 7884288.

The previous prime is 20069437. The next prime is 20069443. The reversal of 20069440 is 4496002.

It is an interprime number because it is at equal distance from previous prime (20069437) and next prime (20069443).

It is not an unprimeable number, because it can be changed into a prime (20069443) 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, 18349 + ... + 19411.

It is an arithmetic number, because the mean of its divisors is an integer number (868680).

Almost surely, 2^20069440 is an apocalyptic number.

20069440 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 20069440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24323040).

20069440 is an abundant number, since it is smaller than the sum of its proper divisors (28576640).

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

20069440 is a wasteful number, since it uses less digits than its factorization.

20069440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20069440 is about 4479.8928558616. The cubic root of 20069440 is about 271.7555473833.

The spelling of 20069440 in words is "twenty million, sixty-nine thousand, four hundred forty".