21930460 has 24 divisors (see below), whose sum is σ = 46181520. Its totient is φ = 8747904.

The previous prime is 21930457. The next prime is 21930463. The reversal of 21930460 is 6403912.

It is an interprime number because it is at equal distance from previous prime (21930457) and next prime (21930463).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930463) 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 7 ways as a sum of consecutive naturals, for example, 7072 + ... + 9688.

It is an arithmetic number, because the mean of its divisors is an integer number (1924230).

Almost surely, 2^21930460 is an apocalyptic number.

21930460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21930460 is an abundant number, since it is smaller than the sum of its proper divisors (24251060).

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

21930460 is a wasteful number, since it uses less digits than its factorization.

21930460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045 (or 3043 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 21930460 is about 4682.9969036932. The cubic root of 21930460 is about 279.9083883967.

The spelling of 21930460 in words is "twenty-one million, nine hundred thirty thousand, four hundred sixty".