20903140 has 12 divisors (see below), whose sum is σ = 43896636. Its totient is φ = 8361248.

The previous prime is 20903111. The next prime is 20903143. The reversal of 20903140 is 4130902.

It can be written as a sum of positive squares in 2 ways, for example, as 12236004 + 8667136 = 3498^2 + 2944^2 .

It is a super-3 number, since 3×20903140³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20903143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522559 + ... + 522598.

It is an arithmetic number, because the mean of its divisors is an integer number (3658053).

Almost surely, 2^20903140 is an apocalyptic number.

20903140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20903140 is an abundant number, since it is smaller than the sum of its proper divisors (22993496).

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

20903140 is a wasteful number, since it uses less digits than its factorization.

20903140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045166 (or 1045164 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20903140 is about 4571.9951880990. The cubic root of 20903140 is about 275.4675901677.

The spelling of 20903140 in words is "twenty million, nine hundred three thousand, one hundred forty".