20661458 has 8 divisors (see below), whose sum is σ = 31748220. Its totient is φ = 10078720.

The previous prime is 20661437. The next prime is 20661463. The reversal of 20661458 is 85416602.

It can be written as a sum of positive squares in 2 ways, for example, as 18550249 + 2111209 = 4307^2 + 1453^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125903 + ... + 126066.

Almost surely, 2^20661458 is an apocalyptic number.

20661458 is a deficient number, since it is larger than the sum of its proper divisors (11086762).

20661458 is a wasteful number, since it uses less digits than its factorization.

20661458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252012.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20661458 is about 4545.4876526067. The cubic root of 20661458 is about 274.4018204454.

The spelling of 20661458 in words is "twenty million, six hundred sixty-one thousand, four hundred fifty-eight".