20700042 has 16 divisors (see below), whose sum is σ = 45163872. Its totient is φ = 6272720.

The previous prime is 20700041. The next prime is 20700049. The reversal of 20700042 is 24000702.

It is a junction number, because it is equal to n+sod(n) for n = 20699994 and 20700030.

It is not an unprimeable number, because it can be changed into a prime (20700041) 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, 156753 + ... + 156884.

It is an arithmetic number, because the mean of its divisors is an integer number (2822742).

Almost surely, 2^20700042 is an apocalyptic number.

20700042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20700042 is an abundant number, since it is smaller than the sum of its proper divisors (24463830).

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

20700042 is a wasteful number, since it uses less digits than its factorization.

20700042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313653.

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 20700042 is about 4549.7298820919. The cubic root of 20700042 is about 274.5725237287.

Adding to 20700042 its reverse (24000702), we get a palindrome (44700744).

The spelling of 20700042 in words is "twenty million, seven hundred thousand, forty-two".