20976648 has 64 divisors (see below), whose sum is σ = 65387520. Its totient is φ = 5448000.

The previous prime is 20976611. The next prime is 20976649. The reversal of 20976648 is 84667902.

It is a super-2 number, since 2×20976648² = 880039522631808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (20976649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3828 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (1021680).

Almost surely, 2^20976648 is an apocalyptic number.

20976648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20976648 is an abundant number, since it is smaller than the sum of its proper divisors (44410872).

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

20976648 is a wasteful number, since it uses less digits than its factorization.

20976648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11378 (or 11374 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20976648 is about 4580.0270741558. The cubic root of 20976648 is about 275.7901155860.

The spelling of 20976648 in words is "twenty million, nine hundred seventy-six thousand, six hundred forty-eight".