20429900 has 18 divisors (see below), whose sum is σ = 44333100. Its totient is φ = 8171920.

The previous prime is 20429881. The next prime is 20429909. The reversal of 20429900 is 992402.

It is a self number, because there is not a number n which added to its sum of digits gives 20429900.

It is not an unprimeable number, because it can be changed into a prime (20429909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102050 + ... + 102249.

It is an arithmetic number, because the mean of its divisors is an integer number (2462950).

Almost surely, 2^20429900 is an apocalyptic number.

20429900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20429900 is an abundant number, since it is smaller than the sum of its proper divisors (23903200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20429900 is a wasteful number, since it uses less digits than its factorization.

20429900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204313 (or 204306 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20429900 is about 4519.9446899271. The cubic root of 20429900 is about 273.3728708753.

The spelling of 20429900 in words is "twenty million, four hundred twenty-nine thousand, nine hundred".