20756942 has 4 divisors (see below), whose sum is σ = 31135416. Its totient is φ = 10378470.

The previous prime is 20756941. The next prime is 20756951. The reversal of 20756942 is 24965702.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20756941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5189234 + ... + 5189237.

It is an arithmetic number, because the mean of its divisors is an integer number (7783854).

Almost surely, 2^20756942 is an apocalyptic number.

20756942 is a deficient number, since it is larger than the sum of its proper divisors (10378474).

20756942 is a wasteful number, since it uses less digits than its factorization.

20756942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10378473.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20756942 is about 4555.9787093445. The cubic root of 20756942 is about 274.8238739996.

The spelling of 20756942 in words is "twenty million, seven hundred fifty-six thousand, nine hundred forty-two".