20469440 has 56 divisors (see below), whose sum is σ = 49816512. Its totient is φ = 8007680.

The previous prime is 20469433. The next prime is 20469451. The reversal of 20469440 is 4496402.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14360 + ... + 15720.

Almost surely, 2^20469440 is an apocalyptic number.

20469440 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 20469440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24908256).

20469440 is an abundant number, since it is smaller than the sum of its proper divisors (29347072).

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

20469440 is a wasteful number, since it uses less digits than its factorization.

20469440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425 (or 1415 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20469440 is about 4524.3165229679. The cubic root of 20469440 is about 273.5491190451.

The spelling of 20469440 in words is "twenty million, four hundred sixty-nine thousand, four hundred forty".