20995500 has 48 divisors (see below), whose sum is σ = 61143264. Its totient is φ = 5598400.

The previous prime is 20995489. The next prime is 20995517. The reversal of 20995500 is 559902.

It is a super-2 number, since 2×20995500² = 881622040500000, which contains 22 as substring.

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

It is an unprimeable number.

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, 5499 + ... + 8498.

It is an arithmetic number, because the mean of its divisors is an integer number (1273818).

Almost surely, 2^20995500 is an apocalyptic number.

20995500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20995500 is an abundant number, since it is smaller than the sum of its proper divisors (40147764).

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

20995500 is a wasteful number, since it uses less digits than its factorization.

20995500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14019 (or 14007 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 20995500 is about 4582.0846783969. The cubic root of 20995500 is about 275.8727096291.

The spelling of 20995500 in words is "twenty million, nine hundred ninety-five thousand, five hundred".