20507953 has 4 divisors (see below), whose sum is σ = 21062260. Its totient is φ = 19953648.

The previous prime is 20507911. The next prime is 20507969. The reversal of 20507953 is 35970502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12510369 + 7997584 = 3537^2 + 2828^2 .

It is a cyclic number.

It is not a de Polignac number, because 20507953 - 2¹³ = 20499761 is a prime.

It is a super-2 number, since 2×20507953² = 841152272500418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20507983) 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, 277098 + ... + 277171.

It is an arithmetic number, because the mean of its divisors is an integer number (5265565).

Almost surely, 2^20507953 is an apocalyptic number.

It is an amenable number.

20507953 is a deficient number, since it is larger than the sum of its proper divisors (554307).

20507953 is an equidigital number, since it uses as much as digits as its factorization.

20507953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554306.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 20507953 is about 4528.5707458314. The cubic root of 20507953 is about 273.7205713310.

The spelling of 20507953 in words is "twenty million, five hundred seven thousand, nine hundred fifty-three".