20397400 has 24 divisors (see below), whose sum is σ = 47424420. Its totient is φ = 8158880.

The previous prime is 20397383. The next prime is 20397409. The reversal of 20397400 is 479302.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20397409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50794 + ... + 51193.

Almost surely, 2^20397400 is an apocalyptic number.

20397400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20397400 is an abundant number, since it is smaller than the sum of its proper divisors (27027020).

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

20397400 is a wasteful number, since it uses less digits than its factorization.

20397400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102003 (or 101994 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20397400 is about 4516.3480822452. The cubic root of 20397400 is about 273.2278329047.

The spelling of 20397400 in words is "twenty million, three hundred ninety-seven thousand, four hundred".