20869500 has 48 divisors (see below), whose sum is σ = 60776352. Its totient is φ = 5564800.

The previous prime is 20869493. The next prime is 20869507. The reversal of 20869500 is 596802.

It is an interprime number because it is at equal distance from previous prime (20869493) and next prime (20869507).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20869507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5457 + ... + 8456.

It is an arithmetic number, because the mean of its divisors is an integer number (1266174).

Almost surely, 2^20869500 is an apocalyptic number.

20869500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20869500 is an abundant number, since it is smaller than the sum of its proper divisors (39906852).

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

20869500 is a wasteful number, since it uses less digits than its factorization.

20869500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13935 (or 13923 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20869500 is about 4568.3147877527. The cubic root of 20869500 is about 275.3197382939.

The spelling of 20869500 in words is "twenty million, eight hundred sixty-nine thousand, five hundred".