20503011 has 8 divisors (see below), whose sum is σ = 27384400. Its totient is φ = 13645152.

The previous prime is 20503001. The next prime is 20503013. The reversal of 20503011 is 11030502.

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

It is not a de Polignac number, because 20503011 - 2⁶ = 20502947 is a prime.

It is a super-2 number, since 2×20503011² = 840746920132242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20503013) 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, 3736 + ... + 7413.

It is an arithmetic number, because the mean of its divisors is an integer number (3423050).

Almost surely, 2^20503011 is an apocalyptic number.

20503011 is a deficient number, since it is larger than the sum of its proper divisors (6881389).

20503011 is a wasteful number, since it uses less digits than its factorization.

20503011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11765.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 20503011 is about 4528.0250661850. The cubic root of 20503011 is about 273.6985825325.

Adding to 20503011 its reverse (11030502), we get a palindrome (31533513).

The spelling of 20503011 in words is "twenty million, five hundred three thousand, eleven".