20156342 has 8 divisors (see below), whose sum is σ = 31051776. Its totient is φ = 9805752.

The previous prime is 20156333. The next prime is 20156369. The reversal of 20156342 is 24365102.

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

It is a congruent number.

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, 136118 + ... + 136265.

It is an arithmetic number, because the mean of its divisors is an integer number (3881472).

Almost surely, 2^20156342 is an apocalyptic number.

20156342 is a deficient number, since it is larger than the sum of its proper divisors (10895434).

20156342 is a wasteful number, since it uses less digits than its factorization.

20156342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272422.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20156342 is about 4489.5814949726. The cubic root of 20156342 is about 272.1472224196.

The spelling of 20156342 in words is "twenty million, one hundred fifty-six thousand, three hundred forty-two".