20957629 has 16 divisors (see below), whose sum is σ = 26689536. Its totient is φ = 15980400.

The previous prime is 20957621. The next prime is 20957653. The reversal of 20957629 is 92675902.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20957629 - 2³ = 20957621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20957591 and 20957600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20957621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724 + ... + 6514.

It is an arithmetic number, because the mean of its divisors is an integer number (1668096).

Almost surely, 2^20957629 is an apocalyptic number.

It is an amenable number.

20957629 is a deficient number, since it is larger than the sum of its proper divisors (5731907).

20957629 is a wasteful number, since it uses less digits than its factorization.

20957629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5856.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 20957629 is about 4577.9503055407. The cubic root of 20957629 is about 275.7067397251.

The spelling of 20957629 in words is "twenty million, nine hundred fifty-seven thousand, six hundred twenty-nine".