20646342 has 24 divisors (see below), whose sum is σ = 45494280. Its totient is φ = 6765120.

The previous prime is 20646317. The next prime is 20646349. The reversal of 20646342 is 24364602.

20646342 is a `hidden beast` number, since 20 + 6 + 4 + 634 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8659 + ... + 10782.

It is an arithmetic number, because the mean of its divisors is an integer number (1895595).

Almost surely, 2^20646342 is an apocalyptic number.

20646342 is an abundant number, since it is smaller than the sum of its proper divisors (24847938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20646342 is a wasteful number, since it uses less digits than its factorization.

20646342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19508 (or 19505 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 20646342 is about 4543.8246004880. The cubic root of 20646342 is about 274.3348863200.

The spelling of 20646342 in words is "twenty million, six hundred forty-six thousand, three hundred forty-two".