20397460 has 12 divisors (see below), whose sum is σ = 42834708. Its totient is φ = 8158976.

The previous prime is 20397427. The next prime is 20397479. The reversal of 20397460 is 6479302.

It can be written as a sum of positive squares in 2 ways, for example, as 9821956 + 10575504 = 3134^2 + 3252^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509917 + ... + 509956.

It is an arithmetic number, because the mean of its divisors is an integer number (3569559).

Almost surely, 2^20397460 is an apocalyptic number.

20397460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20397460 is an abundant number, since it is smaller than the sum of its proper divisors (22437248).

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

20397460 is a wasteful number, since it uses less digits than its factorization.

20397460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019882 (or 1019880 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20397460 is about 4516.3547247753. The cubic root of 20397460 is about 273.2281008090.

The spelling of 20397460 in words is "twenty million, three hundred ninety-seven thousand, four hundred sixty".