20888440 has 16 divisors (see below), whose sum is σ = 46999080. Its totient is φ = 8355360.

The previous prime is 20888431. The next prime is 20888449. The reversal of 20888440 is 4488802.

It is an interprime number because it is at equal distance from previous prime (20888431) and next prime (20888449).

It is a junction number, because it is equal to n+sod(n) for n = 20888396 and 20888405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20888449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261066 + ... + 261145.

Almost surely, 2^20888440 is an apocalyptic number.

20888440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20888440 is an abundant number, since it is smaller than the sum of its proper divisors (26110640).

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

20888440 is a wasteful number, since it uses less digits than its factorization.

20888440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522222 (or 522218 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 34.

The square root of 20888440 is about 4570.3872921231. The cubic root of 20888440 is about 275.4030014157.

The spelling of 20888440 in words is "twenty million, eight hundred eighty-eight thousand, four hundred forty".