20501064 has 24 divisors (see below), whose sum is σ = 55523910. Its totient is φ = 6833664.

The previous prime is 20501029. The next prime is 20501069. The reversal of 20501064 is 46010502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14884164 + 5616900 = 3858^2 + 2370^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is not an unprimeable number, because it can be changed into a prime (20501069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142297 + ... + 142440.

Almost surely, 2^20501064 is an apocalyptic number.

20501064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20501064 is an abundant number, since it is smaller than the sum of its proper divisors (35022846).

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

20501064 is a wasteful number, since it uses less digits than its factorization.

20501064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284749 (or 284742 counting only the distinct ones).

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

The square root of 20501064 is about 4527.8100666879. The cubic root of 20501064 is about 273.6899186342.

Adding to 20501064 its reverse (46010502), we get a palindrome (66511566).

The spelling of 20501064 in words is "twenty million, five hundred one thousand, sixty-four".