20515488 has 48 divisors (see below), whose sum is σ = 61548480. Its totient is φ = 5861376.

The previous prime is 20515487. The next prime is 20515493. The reversal of 20515488 is 88451502.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (20515483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14593 + ... + 15936.

It is an arithmetic number, because the mean of its divisors is an integer number (1282260).

Almost surely, 2^20515488 is an apocalyptic number.

20515488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20515488 is an abundant number, since it is smaller than the sum of its proper divisors (41032992).

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

20515488 is a wasteful number, since it uses less digits than its factorization.

20515488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30549 (or 30541 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 20515488 is about 4529.4026096164. The cubic root of 20515488 is about 273.7540905542.

The spelling of 20515488 in words is "twenty million, five hundred fifteen thousand, four hundred eighty-eight".