20913129 has 12 divisors (see below), whose sum is σ = 31798000. Its totient is φ = 13208184.

The previous prime is 20913083. The next prime is 20913133. The reversal of 20913129 is 92131902.

It is not a de Polignac number, because 20913129 - 2²⁰ = 19864553 is a prime.

It is a super-3 number, since 3×20913129³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20913149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60979 + ... + 61320.

Almost surely, 2^20913129 is an apocalyptic number.

It is an amenable number.

20913129 is a deficient number, since it is larger than the sum of its proper divisors (10884871).

20913129 is a wasteful number, since it uses less digits than its factorization.

20913129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122324 (or 122321 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 20913129 is about 4573.0874690957. The cubic root of 20913129 is about 275.5114624849.

The spelling of 20913129 in words is "twenty million, nine hundred thirteen thousand, one hundred twenty-nine".