20472100 has 72 divisors (see below), whose sum is σ = 49871808. Its totient is φ = 7228800.

The previous prime is 20472091. The next prime is 20472103. The reversal of 20472100 is 127402.

It is not an unprimeable number, because it can be changed into a prime (20472103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40449 + ... + 40951.

It is an arithmetic number, because the mean of its divisors is an integer number (692664).

Almost surely, 2^20472100 is an apocalyptic number.

20472100 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 20472100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24935904).

20472100 is an abundant number, since it is smaller than the sum of its proper divisors (29399708).

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

20472100 is a wasteful number, since it uses less digits than its factorization.

20472100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 20472100 is about 4524.6104804723. The cubic root of 20472100 is about 273.5609677513.

Adding to 20472100 its reverse (127402), we get a palindrome (20599502).

The spelling of 20472100 in words is "twenty million, four hundred seventy-two thousand, one hundred".