20547930 has 128 divisors (see below), whose sum is σ = 58060800. Its totient is φ = 4610304.

The previous prime is 20547887. The next prime is 20547931. The reversal of 20547930 is 3974502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20547931) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 348241 + ... + 348299.

It is an arithmetic number, because the mean of its divisors is an integer number (453600).

Almost surely, 2^20547930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20547930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29030400).

20547930 is an abundant number, since it is smaller than the sum of its proper divisors (37512870).

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

20547930 is a wasteful number, since it uses less digits than its factorization.

20547930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20547930 is about 4532.9824619118. The cubic root of 20547930 is about 273.8983141597.

The spelling of 20547930 in words is "twenty million, five hundred forty-seven thousand, nine hundred thirty".