20947500 has 270 divisors, whose sum is σ = 81020940. Its totient is φ = 4536000.

The previous prime is 20947499. The next prime is 20947517. The reversal of 20947500 is 574902.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 89 ways as a sum of consecutive naturals, for example, 1102491 + ... + 1102509.

Almost surely, 2^20947500 is an apocalyptic number.

20947500 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 20947500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40510470).

20947500 is an abundant number, since it is smaller than the sum of its proper divisors (60073440).

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

20947500 is a wasteful number, since it uses less digits than its factorization.

20947500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20947500 is about 4576.8438907177. The cubic root of 20947500 is about 275.6623154316.

The spelling of 20947500 in words is "twenty million, nine hundred forty-seven thousand, five hundred".