20572146 has 48 divisors (see below), whose sum is σ = 52138944. Its totient is φ = 5739552.

The previous prime is 20572133. The next prime is 20572147. The reversal of 20572146 is 64127502.

It is not an unprimeable number, because it can be changed into a prime (20572147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3520 + ... + 7316.

It is an arithmetic number, because the mean of its divisors is an integer number (1086228).

Almost surely, 2^20572146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20572146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26069472).

20572146 is an abundant number, since it is smaller than the sum of its proper divisors (31566798).

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

20572146 is a wasteful number, since it uses less digits than its factorization.

20572146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855 (or 3852 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20572146 is about 4535.6527644872. The cubic root of 20572146 is about 274.0058694820.

Adding to 20572146 its reverse (64127502), we get a palindrome (84699648).

The spelling of 20572146 in words is "twenty million, five hundred seventy-two thousand, one hundred forty-six".