21627020 has 12 divisors (see below), whose sum is σ = 45416784. Its totient is φ = 8650800.

The previous prime is 21627019. The next prime is 21627031. The reversal of 21627020 is 2072612.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1081351 = 21627020 / (2 + 1 + 6 + 2 + 7 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21626983 and 21627001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540656 + ... + 540695.

It is an arithmetic number, because the mean of its divisors is an integer number (3784732).

Almost surely, 2^21627020 is an apocalyptic number.

21627020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21627020 is an abundant number, since it is smaller than the sum of its proper divisors (23789764).

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

21627020 is a wasteful number, since it uses less digits than its factorization.

21627020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081360 (or 1081358 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21627020 is about 4650.4859961084. The cubic root of 21627020 is about 278.6114073050.

Adding to 21627020 its reverse (2072612), we get a palindrome (23699632).

The spelling of 21627020 in words is "twenty-one million, six hundred twenty-seven thousand, twenty".