20661454 has 8 divisors (see below), whose sum is σ = 33809688. Its totient is φ = 9391560.

The previous prime is 20661437. The next prime is 20661463. The reversal of 20661454 is 45416602.

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

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 3 ways as a sum of consecutive naturals, for example, 469557 + ... + 469600.

It is an arithmetic number, because the mean of its divisors is an integer number (4226211).

Almost surely, 2^20661454 is an apocalyptic number.

20661454 is a deficient number, since it is larger than the sum of its proper divisors (13148234).

20661454 is a wasteful number, since it uses less digits than its factorization.

20661454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939170.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20661454 is about 4545.4872126099. The cubic root of 20661454 is about 274.4018027376.

It can be divided in two parts, 20661 and 454, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20661454 in words is "twenty million, six hundred sixty-one thousand, four hundred fifty-four".