20881470 has 64 divisors (see below), whose sum is σ = 53374464. Its totient is φ = 5216640.

The previous prime is 20881463. The next prime is 20881477. The reversal of 20881470 is 7418802.

It is an interprime number because it is at equal distance from previous prime (20881463) and next prime (20881477).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36285 + ... + 36855.

It is an arithmetic number, because the mean of its divisors is an integer number (833976).

Almost surely, 2^20881470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20881470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26687232).

20881470 is an abundant number, since it is smaller than the sum of its proper divisors (32492994).

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

20881470 is a wasteful number, since it uses less digits than its factorization.

20881470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 20881470 is about 4569.6247110676. The cubic root of 20881470 is about 275.3723660904.

The spelling of 20881470 in words is "twenty million, eight hundred eighty-one thousand, four hundred seventy".