20987458 has 8 divisors (see below), whose sum is σ = 31924800. Its totient is φ = 10345860.

The previous prime is 20987453. The next prime is 20987479. The reversal of 20987458 is 85478902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20987453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73758 + ... + 74041.

It is an arithmetic number, because the mean of its divisors is an integer number (3990600).

Almost surely, 2^20987458 is an apocalyptic number.

20987458 is a deficient number, since it is larger than the sum of its proper divisors (10937342).

20987458 is a wasteful number, since it uses less digits than its factorization.

20987458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147872.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 20987458 is about 4581.2070461834. The cubic root of 20987458 is about 275.8374822128.

The spelling of 20987458 in words is "twenty million, nine hundred eighty-seven thousand, four hundred fifty-eight".