20791242 has 20 divisors (see below), whose sum is σ = 46588146. Its totient is φ = 6930360.

The previous prime is 20791229. The next prime is 20791247. The reversal of 20791242 is 24219702.

It can be written as a sum of positive squares in only one way, i.e., 13549761 + 7241481 = 3681^2 + 2691^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20791247) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 64009 + ... + 64332.

Almost surely, 2^20791242 is an apocalyptic number.

20791242 is an abundant number, since it is smaller than the sum of its proper divisors (25796904).

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

20791242 is a wasteful number, since it uses less digits than its factorization.

20791242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128355 (or 128346 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20791242 is about 4559.7414400380. The cubic root of 20791242 is about 274.9751691078.

It can be divided in two parts, 2079 and 1242, that added together give a triangular number (3321 = T₈₁).

The spelling of 20791242 in words is "twenty million, seven hundred ninety-one thousand, two hundred forty-two".