20953731 has 8 divisors (see below), whose sum is σ = 28050624. Its totient is φ = 13913000.

The previous prime is 20953717. The next prime is 20953811. The reversal of 20953731 is 13735902.

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

It is a cyclic number.

It is not a de Polignac number, because 20953731 - 2¹¹ = 20951683 is a prime.

It is a super-2 number, since 2×20953731² = 878117685640722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20953531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13161 + ... + 14666.

It is an arithmetic number, because the mean of its divisors is an integer number (3506328).

Almost surely, 2^20953731 is an apocalyptic number.

20953731 is a deficient number, since it is larger than the sum of its proper divisors (7096893).

20953731 is a wasteful number, since it uses less digits than its factorization.

20953731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28081.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 20953731 is about 4577.5245493607. The cubic root of 20953731 is about 275.6896453692.

The spelling of 20953731 in words is "twenty million, nine hundred fifty-three thousand, seven hundred thirty-one".