20695580 has 24 divisors (see below), whose sum is σ = 44636928. Its totient is φ = 8054208.

The previous prime is 20695559. The next prime is 20695601. The reversal of 20695580 is 8559602.

It is an interprime number because it is at equal distance from previous prime (20695559) and next prime (20695601).

It is a self number, because there is not a number n which added to its sum of digits gives 20695580.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13244 + ... + 14723.

It is an arithmetic number, because the mean of its divisors is an integer number (1859872).

Almost surely, 2^20695580 is an apocalyptic number.

20695580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20695580 is an abundant number, since it is smaller than the sum of its proper divisors (23941348).

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

20695580 is a wasteful number, since it uses less digits than its factorization.

20695580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28013 (or 28011 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 20695580 is about 4549.2394968830. The cubic root of 20695580 is about 274.5527938067.

The spelling of 20695580 in words is "twenty million, six hundred ninety-five thousand, five hundred eighty".