20136403 has 12 divisors (see below), whose sum is σ = 23610312. Its totient is φ = 17122560.

The previous prime is 20136383. The next prime is 20136407. The reversal of 20136403 is 30463102.

It is not a de Polignac number, because 20136403 - 2¹³ = 20128211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20136407) 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, 4851 + ... + 7987.

It is an arithmetic number, because the mean of its divisors is an integer number (1967526).

Almost surely, 2^20136403 is an apocalyptic number.

20136403 is a deficient number, since it is larger than the sum of its proper divisors (3473909).

20136403 is a wasteful number, since it uses less digits than its factorization.

20136403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282 (or 3275 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20136403 is about 4487.3603599444. The cubic root of 20136403 is about 272.0574552431.

Adding to 20136403 its reverse (30463102), we get a palindrome (50599505).

The spelling of 20136403 in words is "twenty million, one hundred thirty-six thousand, four hundred three".