20400103 has 8 divisors (see below), whose sum is σ = 21783168. Its totient is φ = 19058424.

The previous prime is 20400101. The next prime is 20400151. The reversal of 20400103 is 30100402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20400103 - 2¹ = 20400101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20400103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9325 + ... + 11302.

It is an arithmetic number, because the mean of its divisors is an integer number (2722896).

Almost surely, 2^20400103 is an apocalyptic number.

20400103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20400103 is a deficient number, since it is larger than the sum of its proper divisors (1383065).

20400103 is a wasteful number, since it uses less digits than its factorization.

20400103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20693.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 20400103 is about 4516.6473185317. The cubic root of 20400103 is about 273.2399014724.

Adding to 20400103 its reverse (30100402), we get a palindrome (50500505).

It can be divided in two parts, 20400 and 103, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 20400103 in words is "twenty million, four hundred thousand, one hundred three".