20674830 has 128 divisors (see below), whose sum is σ = 58392576. Its totient is φ = 4636800.

The previous prime is 20674817. The next prime is 20674837. The reversal of 20674830 is 3847602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20674837) 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, 439867 + ... + 439913.

It is an arithmetic number, because the mean of its divisors is an integer number (456192).

Almost surely, 2^20674830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20674830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29196288).

20674830 is an abundant number, since it is smaller than the sum of its proper divisors (37717746).

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

20674830 is a wasteful number, since it uses less digits than its factorization.

20674830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20674830 is about 4546.9583239788. The cubic root of 20674830 is about 274.4610048754.

The spelling of 20674830 in words is "twenty million, six hundred seventy-four thousand, eight hundred thirty".