20201100 has 108 divisors (see below), whose sum is σ = 62355384. Its totient is φ = 5048320.

The previous prime is 20201089. The next prime is 20201101. The reversal of 20201100 is 110202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is not an unprimeable number, because it can be changed into a prime (20201101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 86584 + ... + 86816.

Almost surely, 2^20201100 is an apocalyptic number.

20201100 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 20201100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31177692).

20201100 is an abundant number, since it is smaller than the sum of its proper divisors (42154284).

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

20201100 is a wasteful number, since it uses less digits than its factorization.

20201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 20201100 is about 4494.5633825768. The cubic root of 20201100 is about 272.3485115973.

Adding to 20201100 its reverse (110202), we get a palindrome (20311302).

It can be divided in two parts, 20201 and 100, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 20201100 in words is "twenty million, two hundred one thousand, one hundred".