20660451 has 16 divisors (see below), whose sum is σ = 31584000. Its totient is φ = 11767968.

The previous prime is 20660399. The next prime is 20660473. The reversal of 20660451 is 15406602.

It is not a de Polignac number, because 20660451 - 2⁷ = 20660323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20660051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5920 + ... + 8738.

It is an arithmetic number, because the mean of its divisors is an integer number (1974000).

Almost surely, 2^20660451 is an apocalyptic number.

20660451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20660451 is a deficient number, since it is larger than the sum of its proper divisors (10923549).

20660451 is a wasteful number, since it uses less digits than its factorization.

20660451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20660451 is about 4545.3768820638. The cubic root of 20660451 is about 274.3973624328.

The spelling of 20660451 in words is "twenty million, six hundred sixty thousand, four hundred fifty-one".