20797400 has 96 divisors (see below), whose sum is σ = 54944400. Its totient is φ = 7257600.

The previous prime is 20797363. The next prime is 20797411. The reversal of 20797400 is 479702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49190 + ... + 49610.

Almost surely, 2^20797400 is an apocalyptic number.

20797400 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 20797400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27472200).

20797400 is an abundant number, since it is smaller than the sum of its proper divisors (34147000).

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

20797400 is a wasteful number, since it uses less digits than its factorization.

20797400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20797400 is about 4560.4166476321. The cubic root of 20797400 is about 275.0023140301.

The spelling of 20797400 in words is "twenty million, seven hundred ninety-seven thousand, four hundred".