20712278 has 8 divisors (see below), whose sum is σ = 32070720. Its totient is φ = 10022040.

The previous prime is 20712271. The next prime is 20712281. The reversal of 20712278 is 87221702.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20712278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166973 + ... + 167096.

It is an arithmetic number, because the mean of its divisors is an integer number (4008840).

Almost surely, 2^20712278 is an apocalyptic number.

20712278 is a deficient number, since it is larger than the sum of its proper divisors (11358442).

20712278 is a wasteful number, since it uses less digits than its factorization.

20712278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334102.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20712278 is about 4551.0743786495. The cubic root of 20712278 is about 274.6266139191.

The spelling of 20712278 in words is "twenty million, seven hundred twelve thousand, two hundred seventy-eight".