20480997 has 12 divisors (see below), whose sum is σ = 27668864. Its totient is φ = 13475880.

The previous prime is 20480969. The next prime is 20481007. The reversal of 20480997 is 79908402.

It is not a de Polignac number, because 20480997 - 2¹¹ = 20478949 is a prime.

It is a super-2 number, since 2×20480997² = 838942476228018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20480797) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20172 + ... + 21162.

Almost surely, 2^20480997 is an apocalyptic number.

It is an amenable number.

20480997 is a deficient number, since it is larger than the sum of its proper divisors (7187867).

20480997 is an frugal number, since it uses more digits than its factorization.

20480997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160 (or 1077 counting only the distinct ones).

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

The square root of 20480997 is about 4525.5935522316. The cubic root of 20480997 is about 273.6005910994.

The spelling of 20480997 in words is "twenty million, four hundred eighty thousand, nine hundred ninety-seven".