20896440 has 32 divisors (see below), whose sum is σ = 62689680. Its totient is φ = 5572352.

The previous prime is 20896423. The next prime is 20896441. The reversal of 20896440 is 4469802.

It is a super-2 number, since 2×20896440² = 873322409347200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20896441) 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, 86949 + ... + 87188.

Almost surely, 2^20896440 is an apocalyptic number.

20896440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20896440 is an abundant number, since it is smaller than the sum of its proper divisors (41793240).

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

20896440 is a wasteful number, since it uses less digits than its factorization.

20896440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174151 (or 174147 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20896440 is about 4571.2624076944. The cubic root of 20896440 is about 275.4381555137.

The spelling of 20896440 in words is "twenty million, eight hundred ninety-six thousand, four hundred forty".