20662851 has 8 divisors (see below), whose sum is σ = 30055104. Its totient is φ = 12522920.

The previous prime is 20662847. The next prime is 20662891. The reversal of 20662851 is 15826602.

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

It is a cyclic number.

It is not a de Polignac number, because 20662851 - 2² = 20662847 is a prime.

It is a super-2 number, since 2×20662851² = 853906822896402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20662801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313041 + ... + 313106.

It is an arithmetic number, because the mean of its divisors is an integer number (3756888).

Almost surely, 2^20662851 is an apocalyptic number.

20662851 is a deficient number, since it is larger than the sum of its proper divisors (9392253).

20662851 is a wasteful number, since it uses less digits than its factorization.

20662851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626161.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20662851 is about 4545.6408789081. The cubic root of 20662851 is about 274.4079870503.

The spelling of 20662851 in words is "twenty million, six hundred sixty-two thousand, eight hundred fifty-one".