20953086 has 144 divisors (see below), whose sum is σ = 58222080. Its totient is φ = 4989600.

The previous prime is 20953081. The next prime is 20953087. The reversal of 20953086 is 68035902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20953081) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 675891 + ... + 675921.

It is an arithmetic number, because the mean of its divisors is an integer number (404320).

Almost surely, 2^20953086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20953086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29111040).

20953086 is an abundant number, since it is smaller than the sum of its proper divisors (37268994).

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

20953086 is a wasteful number, since it uses less digits than its factorization.

20953086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20953086 is about 4577.4540958922. The cubic root of 20953086 is about 275.6868165708.

Adding to 20953086 its reverse (68035902), we get a palindrome (88988988).

The spelling of 20953086 in words is "twenty million, nine hundred fifty-three thousand, eighty-six".