20516070 has 64 divisors (see below), whose sum is σ = 51114240. Its totient is φ = 5267328.

The previous prime is 20516057. The next prime is 20516071. The reversal of 20516070 is 7061502.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118504 + ... + 118676.

It is an arithmetic number, because the mean of its divisors is an integer number (798660).

Almost surely, 2^20516070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20516070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25557120).

20516070 is an abundant number, since it is smaller than the sum of its proper divisors (30598170).

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

20516070 is a wasteful number, since it uses less digits than its factorization.

20516070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20516070 is about 4529.4668560439. The cubic root of 20516070 is about 273.7566792224.

Adding to 20516070 its reverse (7061502), we get a palindrome (27577572).

The spelling of 20516070 in words is "twenty million, five hundred sixteen thousand, seventy".