20321070 has 128 divisors (see below), whose sum is σ = 64143360. Its totient is φ = 3991680.

The previous prime is 20321057. The next prime is 20321071. The reversal of 20321070 is 7012302.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321071) 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, 43659 + ... + 44121.

It is an arithmetic number, because the mean of its divisors is an integer number (501120).

Almost surely, 2^20321070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20321070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32071680).

20321070 is an abundant number, since it is smaller than the sum of its proper divisors (43822290).

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

20321070 is a wasteful number, since it uses less digits than its factorization.

20321070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 20321070 is about 4507.8897502046. The cubic root of 20321070 is about 272.8865876244.

Adding to 20321070 its reverse (7012302), we get a palindrome (27333372).

The spelling of 20321070 in words is "twenty million, three hundred twenty-one thousand, seventy".