20670504 has 64 divisors (see below), whose sum is σ = 56635200. Its totient is φ = 6257664.

The previous prime is 20670497. The next prime is 20670509. The reversal of 20670504 is 40507602.

It is a happy number.

It is a super-2 number, since 2×20670504² = 854539471228032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20670509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10959 + ... + 12705.

It is an arithmetic number, because the mean of its divisors is an integer number (884925).

Almost surely, 2^20670504 is an apocalyptic number.

20670504 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 20670504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28317600).

20670504 is an abundant number, since it is smaller than the sum of its proper divisors (35964696).

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

20670504 is a wasteful number, since it uses less digits than its factorization.

20670504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20670504 is about 4546.4825964695. The cubic root of 20670504 is about 274.4418608062.

The spelling of 20670504 in words is "twenty million, six hundred seventy thousand, five hundred four".