20497000 has 64 divisors (see below), whose sum is σ = 48672000. Its totient is φ = 8078400.

The previous prime is 20496977. The next prime is 20497003. The reversal of 20497000 is 79402.

It is not an unprimeable number, because it can be changed into a prime (20497003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102901 + ... + 103099.

It is an arithmetic number, because the mean of its divisors is an integer number (760500).

Almost surely, 2^20497000 is an apocalyptic number.

20497000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20497000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24336000).

20497000 is an abundant number, since it is smaller than the sum of its proper divisors (28175000).

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

20497000 is a wasteful number, since it uses less digits than its factorization.

20497000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20497000 is about 4527.3612623691. The cubic root of 20497000 is about 273.6718325919.

The spelling of 20497000 in words is "twenty million, four hundred ninety-seven thousand".