20739970 has 8 divisors (see below), whose sum is σ = 37331964. Its totient is φ = 8295984.

The previous prime is 20739947. The next prime is 20740003. The reversal of 20739970 is 7993702.

It can be written as a sum of positive squares in 2 ways, for example, as 20223009 + 516961 = 4497^2 + 719^2 .

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

It is an unprimeable number.

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, 1036989 + ... + 1037008.

Almost surely, 2^20739970 is an apocalyptic number.

20739970 is a deficient number, since it is larger than the sum of its proper divisors (16591994).

20739970 is a wasteful number, since it uses less digits than its factorization.

20739970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074004.

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 20739970 is about 4554.1157209715. The cubic root of 20739970 is about 274.7489499472.

The spelling of 20739970 in words is "twenty million, seven hundred thirty-nine thousand, nine hundred seventy".