20847000 has 64 divisors (see below), whose sum is σ = 65052000. Its totient is φ = 5558400.

The previous prime is 20846977. The next prime is 20847007. The reversal of 20847000 is 74802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20847007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475 + ... + 6474.

Almost surely, 2^20847000 is an apocalyptic number.

20847000 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 20847000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32526000).

20847000 is an abundant number, since it is smaller than the sum of its proper divisors (44205000).

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

20847000 is a wasteful number, since it uses less digits than its factorization.

20847000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973 (or 6959 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20847000 is about 4565.8515087550. The cubic root of 20847000 is about 275.2207593746.

The spelling of 20847000 in words is "twenty million, eight hundred forty-seven thousand".