20169240 has 128 divisors (see below), whose sum is σ = 74511360. Its totient is φ = 4253184.

The previous prime is 20169217. The next prime is 20169271. The reversal of 20169240 is 4296102.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20169240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9997 + ... + 11843.

It is an arithmetic number, because the mean of its divisors is an integer number (582120).

Almost surely, 2^20169240 is an apocalyptic number.

20169240 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 20169240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37255680).

20169240 is an abundant number, since it is smaller than the sum of its proper divisors (54342120).

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

20169240 is a wasteful number, since it uses less digits than its factorization.

20169240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881 (or 1877 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20169240 is about 4491.0177020359. The cubic root of 20169240 is about 272.2052588501.

The spelling of 20169240 in words is "twenty million, one hundred sixty-nine thousand, two hundred forty".