20503388 has 12 divisors (see below), whose sum is σ = 36164352. Its totient is φ = 10170720.

The previous prime is 20503387. The next prime is 20503391. The reversal of 20503388 is 88330502.

It is a self number, because there is not a number n which added to its sum of digits gives 20503388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19673 + ... + 20688.

It is an arithmetic number, because the mean of its divisors is an integer number (3013696).

Almost surely, 2^20503388 is an apocalyptic number.

It is an amenable number.

20503388 is a deficient number, since it is larger than the sum of its proper divisors (15660964).

20503388 is a wasteful number, since it uses less digits than its factorization.

20503388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40492 (or 40490 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20503388 is about 4528.0666956219. The cubic root of 20503388 is about 273.7002600704.

The spelling of 20503388 in words is "twenty million, five hundred three thousand, three hundred eighty-eight".