20503470 has 64 divisors (see below), whose sum is σ = 55802880. Its totient is φ = 4779648.

The previous prime is 20503463. The next prime is 20503481. The reversal of 20503470 is 7430502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6027 + ... + 8793.

It is an arithmetic number, because the mean of its divisors is an integer number (871920).

Almost surely, 2^20503470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20503470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27901440).

20503470 is an abundant number, since it is smaller than the sum of its proper divisors (35299410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20503470 is a wasteful number, since it uses less digits than its factorization.

20503470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2809.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 20503470 is about 4528.0757502498. The cubic root of 20503470 is about 273.7006249433.

Adding to 20503470 its reverse (7430502), we get a palindrome (27933972).

The spelling of 20503470 in words is "twenty million, five hundred three thousand, four hundred seventy".