20742903 has 24 divisors (see below), whose sum is σ = 31039008. Its totient is φ = 13338432.

The previous prime is 20742901. The next prime is 20742919. The reversal of 20742903 is 30924702.

It is not a de Polignac number, because 20742903 - 2¹ = 20742901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55425 + ... + 55797.

It is an arithmetic number, because the mean of its divisors is an integer number (1293292).

Almost surely, 2^20742903 is an apocalyptic number.

20742903 is a deficient number, since it is larger than the sum of its proper divisors (10296105).

20742903 is a wasteful number, since it uses less digits than its factorization.

20742903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20742903 is about 4554.4377259987. The cubic root of 20742903 is about 274.7619007966.

The spelling of 20742903 in words is "twenty million, seven hundred forty-two thousand, nine hundred three".