20129902 has 16 divisors (see below), whose sum is σ = 32820480. Its totient is φ = 9204192.

The previous prime is 20129897. The next prime is 20129909. The reversal of 20129902 is 20992102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718 + ... + 6385.

It is an arithmetic number, because the mean of its divisors is an integer number (2051280).

Almost surely, 2^20129902 is an apocalyptic number.

20129902 is a deficient number, since it is larger than the sum of its proper divisors (12690578).

20129902 is a wasteful number, since it uses less digits than its factorization.

20129902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7227.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20129902 is about 4486.6359335253. The cubic root of 20129902 is about 272.0281743451.

It can be divided in two parts, 201 and 29902, that added together give a palindrome (30103).

The spelling of 20129902 in words is "twenty million, one hundred twenty-nine thousand, nine hundred two".