20307100 has 36 divisors (see below), whose sum is σ = 48075048. Its totient is φ = 7384000.

The previous prime is 20307071. The next prime is 20307103. The reversal of 20307100 is 170302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20307103) 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, 8131 + ... + 10330.

It is an arithmetic number, because the mean of its divisors is an integer number (1335418).

Almost surely, 2^20307100 is an apocalyptic number.

20307100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20307100 is an abundant number, since it is smaller than the sum of its proper divisors (27767948).

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

20307100 is a wasteful number, since it uses less digits than its factorization.

20307100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18486 (or 18479 counting only the distinct ones).

The product of its (nonzero) digits is 42, while the sum is 13.

The square root of 20307100 is about 4506.3399782972. The cubic root of 20307100 is about 272.8240400723.

Adding to 20307100 its reverse (170302), we get a palindrome (20477402).

The spelling of 20307100 in words is "twenty million, three hundred seven thousand, one hundred".