20497428 has 96 divisors (see below), whose sum is σ = 63974400. Its totient is φ = 5544288.

The previous prime is 20497391. The next prime is 20497429. The reversal of 20497428 is 82479402.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20497392 and 20497401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13651 + ... + 15077.

It is an arithmetic number, because the mean of its divisors is an integer number (666400).

Almost surely, 2^20497428 is an apocalyptic number.

20497428 is a gapful number since it is divisible by the number (28) 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 20497428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31987200).

20497428 is an abundant number, since it is smaller than the sum of its proper divisors (43476972).

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

20497428 is a wasteful number, since it uses less digits than its factorization.

20497428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466 (or 1458 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20497428 is about 4527.4085302742. The cubic root of 20497428 is about 273.6737374353.

The spelling of 20497428 in words is "twenty million, four hundred ninety-seven thousand, four hundred twenty-eight".