20401003 has 24 divisors (see below), whose sum is σ = 26470800. Its totient is φ = 15579648.

The previous prime is 20401001. The next prime is 20401009. The reversal of 20401003 is 30010402.

It is not a de Polignac number, because 20401003 - 2¹ = 20401001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20401001) 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, 15183 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (1102950).

Almost surely, 2^20401003 is an apocalyptic number.

20401003 is a deficient number, since it is larger than the sum of its proper divisors (6069797).

20401003 is a wasteful number, since it uses less digits than its factorization.

20401003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339 (or 1332 counting only the distinct ones).

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

The square root of 20401003 is about 4516.7469488560. The cubic root of 20401003 is about 273.2439196269.

Adding to 20401003 its reverse (30010402), we get a palindrome (50411405).

The spelling of 20401003 in words is "twenty million, four hundred one thousand, three".