20903880 has 64 divisors (see below), whose sum is σ = 66407040. Its totient is φ = 5245952.

The previous prime is 20903879. The next prime is 20903881. The reversal of 20903880 is 8830902.

It is an interprime number because it is at equal distance from previous prime (20903879) and next prime (20903881).

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

It is not an unprimeable number, because it can be changed into a prime (20903881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3084 + ... + 7163.

It is an arithmetic number, because the mean of its divisors is an integer number (1037610).

Almost surely, 2^20903880 is an apocalyptic number.

20903880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20903880 is an abundant number, since it is smaller than the sum of its proper divisors (45503160).

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

20903880 is a wasteful number, since it uses less digits than its factorization.

20903880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10278 (or 10274 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20903880 is about 4572.0761148520. The cubic root of 20903880 is about 275.4708407736.

The spelling of 20903880 in words is "twenty million, nine hundred three thousand, eight hundred eighty".