20649942 has 24 divisors (see below), whose sum is σ = 45206616. Its totient is φ = 6811776.

The previous prime is 20649931. The next prime is 20649947. The reversal of 20649942 is 24994602.

20649942 is a `hidden beast` number, since 2 + 0 + 649 + 9 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20649897 and 20649906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20649947) 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, 4168 + ... + 7659.

It is an arithmetic number, because the mean of its divisors is an integer number (1883609).

Almost surely, 2^20649942 is an apocalyptic number.

20649942 is an abundant number, since it is smaller than the sum of its proper divisors (24556674).

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

20649942 is a wasteful number, since it uses less digits than its factorization.

20649942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11932 (or 11929 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 20649942 is about 4544.2207252729. The cubic root of 20649942 is about 274.3508301968.

The spelling of 20649942 in words is "twenty million, six hundred forty-nine thousand, nine hundred forty-two".