16503420 has 48 divisors (see below), whose sum is σ = 48222720. Its totient is φ = 4209216.

The previous prime is 16503391. The next prime is 16503437. The reversal of 16503420 is 2430561.

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 15 ways as a sum of consecutive naturals, for example, 4600 + ... + 7359.

It is an arithmetic number, because the mean of its divisors is an integer number (1004640).

Almost surely, 2^16503420 is an apocalyptic number.

16503420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16503420 is an abundant number, since it is smaller than the sum of its proper divisors (31719300).

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

16503420 is a wasteful number, since it uses less digits than its factorization.

16503420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11994 (or 11992 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 16503420 is about 4062.4401534053. The cubic root of 16503420 is about 254.5997565813.

Adding to 16503420 its reverse (2430561), we get a palindrome (18933981).

It can be divided in two parts, 1 and 6503420, that added together give a triangular number (6503421 = T₃₆₀₆).

The spelling of 16503420 in words is "sixteen million, five hundred three thousand, four hundred twenty".