20903480 has 64 divisors (see below), whose sum is σ = 51559200. Its totient is φ = 7580160.

The previous prime is 20903459. The next prime is 20903497. The reversal of 20903480 is 8430902.

It is a super-2 number, since 2×20903480² = 873910952220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 31391 + ... + 32049.

Almost surely, 2^20903480 is an apocalyptic number.

20903480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20903480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25779600).

20903480 is an abundant number, since it is smaller than the sum of its proper divisors (30655720).

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

20903480 is a wasteful number, since it uses less digits than its factorization.

20903480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20903480 is about 4572.0323708390. The cubic root of 20903480 is about 275.4690836989.

The spelling of 20903480 in words is "twenty million, nine hundred three thousand, four hundred eighty".