20909748 has 24 divisors (see below), whose sum is σ = 50364160. Its totient is φ = 6744960.

The previous prime is 20909743. The next prime is 20909753. The reversal of 20909748 is 84790902.

It is an interprime number because it is at equal distance from previous prime (20909743) and next prime (20909753).

It is a super-2 number, since 2×20909748² = 874435122847008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20909741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27733 + ... + 28476.

Almost surely, 2^20909748 is an apocalyptic number.

It is an amenable number.

20909748 is an abundant number, since it is smaller than the sum of its proper divisors (29454412).

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

20909748 is a wasteful number, since it uses less digits than its factorization.

20909748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56247 (or 56245 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20909748 is about 4572.7177914234. The cubic root of 20909748 is about 275.4966144843.

The spelling of 20909748 in words is "twenty million, nine hundred nine thousand, seven hundred forty-eight".