20910042 has 32 divisors (see below), whose sum is σ = 46848000. Its totient is φ = 6912864.

The previous prime is 20910031. The next prime is 20910067. The reversal of 20910042 is 24001902.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20909997 and 20910024.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5334 + ... + 8382.

It is an arithmetic number, because the mean of its divisors is an integer number (1464000).

Almost surely, 2^20910042 is an apocalyptic number.

20910042 is an abundant number, since it is smaller than the sum of its proper divisors (25937958).

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

20910042 is a wasteful number, since it uses less digits than its factorization.

20910042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187 (or 3181 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20910042 is about 4572.7499384943. The cubic root of 20910042 is about 275.4979056783.

Adding to 20910042 its reverse (24001902), we get a palindrome (44911944).

The spelling of 20910042 in words is "twenty million, nine hundred ten thousand, forty-two".