20423130 has 64 divisors (see below), whose sum is σ = 60334848. Its totient is φ = 4308480.

The previous prime is 20423129. The next prime is 20423147. The reversal of 20423130 is 3132402.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1011 + ... + 6470.

It is an arithmetic number, because the mean of its divisors is an integer number (942732).

Almost surely, 2^20423130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20423130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30167424).

20423130 is an abundant number, since it is smaller than the sum of its proper divisors (39911718).

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

20423130 is a wasteful number, since it uses less digits than its factorization.

20423130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7511.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20423130 is about 4519.1957249050. The cubic root of 20423130 is about 273.3426710406.

Adding to 20423130 its reverse (3132402), we get a palindrome (23555532).

The spelling of 20423130 in words is "twenty million, four hundred twenty-three thousand, one hundred thirty".