20724648 has 48 divisors (see below), whose sum is σ = 60274080. Its totient is φ = 5920992.

The previous prime is 20724637. The next prime is 20724653. The reversal of 20724648 is 84642702.

It is a super-2 number, since 2×20724648² = 859022069447808, which contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7636 + ... + 9987.

It is an arithmetic number, because the mean of its divisors is an integer number (1255710).

Almost surely, 2^20724648 is an apocalyptic number.

20724648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20724648 is an abundant number, since it is smaller than the sum of its proper divisors (39549432).

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

20724648 is a wasteful number, since it uses less digits than its factorization.

20724648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17646 (or 17635 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 20724648 is about 4552.4331955560. The cubic root of 20724648 is about 274.6812748171.

The spelling of 20724648 in words is "twenty million, seven hundred twenty-four thousand, six hundred forty-eight".