20720074 has 8 divisors (see below), whose sum is σ = 31920228. Its totient is φ = 10080000.

The previous prime is 20720057. The next prime is 20720083. The reversal of 20720074 is 47002702.

It can be written as a sum of positive squares in 2 ways, for example, as 20638849 + 81225 = 4543^2 + 285^2 .

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

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, 139927 + ... + 140074.

Almost surely, 2^20720074 is an apocalyptic number.

20720074 is a deficient number, since it is larger than the sum of its proper divisors (11200154).

20720074 is a wasteful number, since it uses less digits than its factorization.

20720074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280040.

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 20720074 is about 4551.9307991225. The cubic root of 20720074 is about 274.6610656345.

Adding to 20720074 its reverse (47002702), we get a palindrome (67722776).

The spelling of 20720074 in words is "twenty million, seven hundred twenty thousand, seventy-four".