20533100 has 36 divisors (see below), whose sum is σ = 50923824. Its totient is φ = 7039680.

The previous prime is 20533063. The next prime is 20533109. The reversal of 20533100 is 133502.

It is a super-2 number, since 2×20533100² = 843216391220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (20533109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13967 + ... + 15366.

Almost surely, 2^20533100 is an apocalyptic number.

20533100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20533100 is an abundant number, since it is smaller than the sum of its proper divisors (30390724).

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

20533100 is a wasteful number, since it uses less digits than its factorization.

20533100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29354 (or 29347 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 20533100 is about 4531.3463782854. The cubic root of 20533100 is about 273.8324050132.

Adding to 20533100 its reverse (133502), we get a palindrome (20666602).

The spelling of 20533100 in words is "twenty million, five hundred thirty-three thousand, one hundred".