20974860 has 72 divisors (see below), whose sum is σ = 66983280. Its totient is φ = 5298048.

The previous prime is 20974853. The next prime is 20974861. The reversal of 20974860 is 6847902.

It is a super-3 number, since 3×20974860³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20974861) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 354 + ... + 6486.

Almost surely, 2^20974860 is an apocalyptic number.

20974860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20974860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33491640).

20974860 is an abundant number, since it is smaller than the sum of its proper divisors (46008420).

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

20974860 is a wasteful number, since it uses less digits than its factorization.

20974860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6167 (or 6162 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20974860 is about 4579.8318746434. The cubic root of 20974860 is about 275.7822794637.

The spelling of 20974860 in words is "twenty million, nine hundred seventy-four thousand, eight hundred sixty".