20782474 has 8 divisors (see below), whose sum is σ = 31206528. Its totient is φ = 10380300.

The previous prime is 20782469. The next prime is 20782477. The reversal of 20782474 is 47428702.

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

It is a super-2 number, since 2×20782474² = 863822451121352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20782477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2842 + ... + 7045.

It is an arithmetic number, because the mean of its divisors is an integer number (3900816).

Almost surely, 2^20782474 is an apocalyptic number.

20782474 is a deficient number, since it is larger than the sum of its proper divisors (10424054).

20782474 is a wasteful number, since it uses less digits than its factorization.

20782474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10940.

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 20782474 is about 4558.7798806260. The cubic root of 20782474 is about 274.9365098609.

The spelling of 20782474 in words is "twenty million, seven hundred eighty-two thousand, four hundred seventy-four".