20732487 has 16 divisors (see below), whose sum is σ = 28522368. Its totient is φ = 13388960.

The previous prime is 20732483. The next prime is 20732501. The reversal of 20732487 is 78423702.

It is a cyclic number.

It is not a de Polignac number, because 20732487 - 2² = 20732483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20732483) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12412 + ... + 13982.

It is an arithmetic number, because the mean of its divisors is an integer number (1782648).

Almost surely, 2^20732487 is an apocalyptic number.

20732487 is a deficient number, since it is larger than the sum of its proper divisors (7789881).

20732487 is a wasteful number, since it uses less digits than its factorization.

20732487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 20732487 is about 4553.2940823101. The cubic root of 20732487 is about 274.7159027489.

It can be divided in two parts, 2073 and 2487, that added together give a triangular number (4560 = T₉₅).

The spelling of 20732487 in words is "twenty million, seven hundred thirty-two thousand, four hundred eighty-seven".