20429157 has 16 divisors (see below), whose sum is σ = 31409280. Its totient is φ = 11569152.

The previous prime is 20429147. The next prime is 20429173. The reversal of 20429157 is 75192402.

It is not a de Polignac number, because 20429157 - 2¹⁸ = 20167013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20429117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1932 + ... + 6677.

It is an arithmetic number, because the mean of its divisors is an integer number (1963080).

Almost surely, 2^20429157 is an apocalyptic number.

It is an amenable number.

20429157 is a deficient number, since it is larger than the sum of its proper divisors (10980123).

20429157 is a wasteful number, since it uses less digits than its factorization.

20429157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8732.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20429157 is about 4519.8624979085. The cubic root of 20429157 is about 273.3695568028.

The spelling of 20429157 in words is "twenty million, four hundred twenty-nine thousand, one hundred fifty-seven".