20269920 has 144 divisors (see below), whose sum is σ = 70383600. Its totient is φ = 4899840.

The previous prime is 20269919. The next prime is 20269943. The reversal of 20269920 is 2996202.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57906 + ... + 58254.

It is an arithmetic number, because the mean of its divisors is an integer number (488775).

Almost surely, 2^20269920 is an apocalyptic number.

20269920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20269920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35191800).

20269920 is an abundant number, since it is smaller than the sum of its proper divisors (50113680).

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

20269920 is a wasteful number, since it uses less digits than its factorization.

20269920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20269920 is about 4502.2127892848. The cubic root of 20269920 is about 272.6574350474.

The spelling of 20269920 in words is "twenty million, two hundred sixty-nine thousand, nine hundred twenty".