20757429 has 54 divisors (see below), whose sum is σ = 38435670. Its totient is φ = 10755360.

The previous prime is 20757427. The next prime is 20757437. The reversal of 20757429 is 92475702.

It can be written as a sum of positive squares in only one way, i.e., 15421329 + 5336100 = 3927^2 + 2310^2 .

It is not a de Polignac number, because 20757429 - 2¹ = 20757427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20757393 and 20757402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20757421) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 53167 + ... + 53555.

Almost surely, 2^20757429 is an apocalyptic number.

It is an amenable number.

20757429 is a deficient number, since it is larger than the sum of its proper divisors (17678241).

20757429 is a wasteful number, since it uses less digits than its factorization.

20757429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20757429 is about 4556.0321552860. The cubic root of 20757429 is about 274.8260232915.

The spelling of 20757429 in words is "twenty million, seven hundred fifty-seven thousand, four hundred twenty-nine".