20520064 has 16 divisors (see below), whose sum is σ = 40880070. Its totient is φ = 10259968.

The previous prime is 20520061. The next prime is 20520067. The reversal of 20520064 is 46002502.

It is an interprime number because it is at equal distance from previous prime (20520061) and next prime (20520067).

It can be written as a sum of positive squares in only one way, i.e., 12902464 + 7617600 = 3592^2 + 2760^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (20520061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80029 + ... + 80284.

Almost surely, 2^20520064 is an apocalyptic number.

It is an amenable number.

20520064 is a deficient number, since it is larger than the sum of its proper divisors (20360006).

20520064 is an equidigital number, since it uses as much as digits as its factorization.

20520064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160327 (or 160315 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20520064 is about 4529.9077253295. The cubic root of 20520064 is about 273.7744427484.

Adding to 20520064 its reverse (46002502), we get a palindrome (66522566).

The spelling of 20520064 in words is "twenty million, five hundred twenty thousand, sixty-four".