20851430 has 8 divisors (see below), whose sum is σ = 37532592. Its totient is φ = 8340568.

The previous prime is 20851399. The next prime is 20851433. The reversal of 20851430 is 3415802.

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

It is a junction number, because it is equal to n+sod(n) for n = 20851396 and 20851405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20851433) 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, 1042562 + ... + 1042581.

It is an arithmetic number, because the mean of its divisors is an integer number (4691574).

Almost surely, 2^20851430 is an apocalyptic number.

20851430 is a deficient number, since it is larger than the sum of its proper divisors (16681162).

20851430 is a wasteful number, since it uses less digits than its factorization.

20851430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085150.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20851430 is about 4566.3366060771. The cubic root of 20851430 is about 275.2402528527.

The spelling of 20851430 in words is "twenty million, eight hundred fifty-one thousand, four hundred thirty".