20015400 has 48 divisors (see below), whose sum is σ = 62049600. Its totient is φ = 5337280.

The previous prime is 20015393. The next prime is 20015419. The reversal of 20015400 is 451002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16080 + ... + 17279.

It is an arithmetic number, because the mean of its divisors is an integer number (1292700).

Almost surely, 2^20015400 is an apocalyptic number.

20015400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20015400 is an abundant number, since it is smaller than the sum of its proper divisors (42034200).

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

20015400 is a wasteful number, since it uses less digits than its factorization.

20015400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33378 (or 33369 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20015400 is about 4473.8573960286. The cubic root of 20015400 is about 271.5114138373.

Adding to 20015400 its reverse (451002), we get a palindrome (20466402).

The spelling of 20015400 in words is "twenty million, fifteen thousand, four hundred".