20942138 has 8 divisors (see below), whose sum is σ = 35900832. Its totient is φ = 8975196.

The previous prime is 20942101. The next prime is 20942149. The reversal of 20942138 is 83124902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20942138² = 877146288022088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20942138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747920 + ... + 747947.

It is an arithmetic number, because the mean of its divisors is an integer number (4487604).

Almost surely, 2^20942138 is an apocalyptic number.

20942138 is a deficient number, since it is larger than the sum of its proper divisors (14958694).

20942138 is a wasteful number, since it uses less digits than its factorization.

20942138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495876.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20942138 is about 4576.2580783868. The cubic root of 20942138 is about 275.6387926966.

The spelling of 20942138 in words is "twenty million, nine hundred forty-two thousand, one hundred thirty-eight".