20121936 has 40 divisors (see below), whose sum is σ = 53196000. Its totient is φ = 6550656.

The previous prime is 20121923. The next prime is 20121947. The reversal of 20121936 is 63912102.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2811 + ... + 6938.

It is an arithmetic number, because the mean of its divisors is an integer number (1329900).

Almost surely, 2^20121936 is an apocalyptic number.

It is an amenable number.

20121936 is an abundant number, since it is smaller than the sum of its proper divisors (33074064).

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

20121936 is a wasteful number, since it uses less digits than its factorization.

20121936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9803 (or 9797 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20121936 is about 4485.7480981437. The cubic root of 20121936 is about 271.9922864018.

The spelling of 20121936 in words is "twenty million, one hundred twenty-one thousand, nine hundred thirty-six".