20721962 has 8 divisors (see below), whose sum is σ = 31102500. Its totient is φ = 10354464.

The previous prime is 20721949. The next prime is 20721983. The reversal of 20721962 is 26912702.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 28561 = 4549^2 + 169^2 .

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3614 + ... + 7382.

Almost surely, 2^20721962 is an apocalyptic number.

20721962 is a deficient number, since it is larger than the sum of its proper divisors (10380538).

20721962 is a wasteful number, since it uses less digits than its factorization.

20721962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6520.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20721962 is about 4552.1381789221. The cubic root of 20721962 is about 274.6694076951.

The spelling of 20721962 in words is "twenty million, seven hundred twenty-one thousand, nine hundred sixty-two".