20770018 has 4 divisors (see below), whose sum is σ = 31155030. Its totient is φ = 10385008.

The previous prime is 20769967. The next prime is 20770049. The reversal of 20770018 is 81007702.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 15233409 + 5536609 = 3903^2 + 2353^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20769974 and 20770001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5192503 + ... + 5192506.

Almost surely, 2^20770018 is an apocalyptic number.

20770018 is a deficient number, since it is larger than the sum of its proper divisors (10385012).

20770018 is a wasteful number, since it uses less digits than its factorization.

20770018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10385011.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 20770018 is about 4557.4135208471. The cubic root of 20770018 is about 274.8815710444.

It can be divided in two parts, 207 and 70018, that added together give a square (70225 = 265²).

The spelling of 20770018 in words is "twenty million, seven hundred seventy thousand, eighteen".