20545100 has 36 divisors (see below), whose sum is σ = 45679368. Its totient is φ = 8016000.

The previous prime is 20545097. The next prime is 20545127. The reversal of 20545100 is 154502.

It is a super-2 number, since 2×20545100² = 844202268020000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1595 + ... + 6605.

Almost surely, 2^20545100 is an apocalyptic number.

20545100 is a gapful number since it is divisible by the number (20) 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 20545100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22839684).

20545100 is an abundant number, since it is smaller than the sum of its proper divisors (25134268).

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

20545100 is a wasteful number, since it uses less digits than its factorization.

20545100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066 (or 5059 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20545100 is about 4532.6702946497. The cubic root of 20545100 is about 273.8857392058.

Adding to 20545100 its reverse (154502), we get a palindrome (20699602).

The spelling of 20545100 in words is "twenty million, five hundred forty-five thousand, one hundred".