20123730 has 48 divisors (see below), whose sum is σ = 57081024. Its totient is φ = 4878240.

The previous prime is 20123713. The next prime is 20123737. The reversal of 20123730 is 3732102.

It is a super-2 number, since 2×20123730² = 809929018225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20123737) 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, 9174 + ... + 11153.

It is an arithmetic number, because the mean of its divisors is an integer number (1189188).

Almost surely, 2^20123730 is an apocalyptic number.

20123730 is an abundant number, since it is smaller than the sum of its proper divisors (36957294).

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

20123730 is a wasteful number, since it uses less digits than its factorization.

20123730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20351 (or 20348 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 20123730 is about 4485.9480603324. The cubic root of 20123730 is about 272.0003694487. Note that the first 3 decimals are identical.

Adding to 20123730 its reverse (3732102), we get a palindrome (23855832).

The spelling of 20123730 in words is "twenty million, one hundred twenty-three thousand, seven hundred thirty".