20845485 has 64 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 10091520.

The previous prime is 20845481. The next prime is 20845499. The reversal of 20845485 is 58454802.

It is not a de Polignac number, because 20845485 - 2² = 20845481 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20845481) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70999 + ... + 71291.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^20845485 is an apocalyptic number.

It is an amenable number.

20845485 is a deficient number, since it is larger than the sum of its proper divisors (19797075).

20845485 is a wasteful number, since it uses less digits than its factorization.

20845485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

The square root of 20845485 is about 4565.6856002138. The cubic root of 20845485 is about 275.2140922354.

It can be divided in two parts, 2084 and 5485, that added together give a square (7569 = 87²).

The spelling of 20845485 in words is "twenty million, eight hundred forty-five thousand, four hundred eighty-five".