20510064 has 80 divisors (see below), whose sum is σ = 59415840. Its totient is φ = 6773760.

The previous prime is 20510053. The next prime is 20510069. The reversal of 20510064 is 46001502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20510069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84984 + ... + 85224.

It is an arithmetic number, because the mean of its divisors is an integer number (742698).

Almost surely, 2^20510064 is an apocalyptic number.

20510064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20510064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29707920).

20510064 is an abundant number, since it is smaller than the sum of its proper divisors (38905776).

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

20510064 is a wasteful number, since it uses less digits than its factorization.

20510064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20510064 is about 4528.8038155787. The cubic root of 20510064 is about 273.7299628795.

Adding to 20510064 its reverse (46001502), we get a palindrome (66511566).

The spelling of 20510064 in words is "twenty million, five hundred ten thousand, sixty-four".