20753381 has 4 divisors (see below), whose sum is σ = 22640064. Its totient is φ = 18866700.

The previous prime is 20753333. The next prime is 20753393. The reversal of 20753381 is 18335702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20753381 is a prime.

It is a super-2 number, since 2×20753381² = 861405645862322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20753321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943325 + ... + 943346.

It is an arithmetic number, because the mean of its divisors is an integer number (5660016).

Almost surely, 2^20753381 is an apocalyptic number.

It is an amenable number.

20753381 is a deficient number, since it is larger than the sum of its proper divisors (1886683).

20753381 is a wasteful number, since it uses less digits than its factorization.

20753381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886682.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20753381 is about 4555.5878874191. The cubic root of 20753381 is about 274.8081571086.

The spelling of 20753381 in words is "twenty million, seven hundred fifty-three thousand, three hundred eighty-one".