20551480 has 32 divisors (see below), whose sum is σ = 46707840. Its totient is φ = 8137600.

The previous prime is 20551477. The next prime is 20551493. The reversal of 20551480 is 8415502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1497 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (1459620).

Almost surely, 2^20551480 is an apocalyptic number.

20551480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20551480 is an abundant number, since it is smaller than the sum of its proper divisors (26156360).

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

20551480 is a wasteful number, since it uses less digits than its factorization.

20551480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5199 (or 5195 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 20551480 is about 4533.3740194253. The cubic root of 20551480 is about 273.9140867627.

Adding to 20551480 its reverse (8415502), we get a palindrome (28966982).

The spelling of 20551480 in words is "twenty million, five hundred fifty-one thousand, four hundred eighty".