20197456 has 60 divisors (see below), whose sum is σ = 43201600. Its totient is φ = 9120384.

The previous prime is 20197453. The next prime is 20197459. The reversal of 20197456 is 65479102.

It is an interprime number because it is at equal distance from previous prime (20197453) and next prime (20197459).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197453) 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, 255625 + ... + 255703.

Almost surely, 2^20197456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20197456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21600800).

20197456 is an abundant number, since it is smaller than the sum of its proper divisors (23004144).

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

20197456 is a wasteful number, since it uses less digits than its factorization.

20197456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20197456 is about 4494.1579856520. The cubic root of 20197456 is about 272.3321346400.

The spelling of 20197456 in words is "twenty million, one hundred ninety-seven thousand, four hundred fifty-six".