20678722 has 4 divisors (see below), whose sum is σ = 31018086. Its totient is φ = 10339360.

The previous prime is 20678699. The next prime is 20678737. The reversal of 20678722 is 22787602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22787602 = 2 ⋅11393801.

It can be written as a sum of positive squares in only one way, i.e., 10699441 + 9979281 = 3271^2 + 3159^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5169679 + ... + 5169682.

Almost surely, 2^20678722 is an apocalyptic number.

20678722 is a deficient number, since it is larger than the sum of its proper divisors (10339364).

20678722 is a wasteful number, since it uses less digits than its factorization.

20678722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10339363.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20678722 is about 4547.3862822505. The cubic root of 20678722 is about 274.4782260602.

The spelling of 20678722 in words is "twenty million, six hundred seventy-eight thousand, seven hundred twenty-two".