20261400 has 48 divisors (see below), whose sum is σ = 62812200. Its totient is φ = 5402880.

The previous prime is 20261363. The next prime is 20261407. The reversal of 20261400 is 416202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20261400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16285 + ... + 17484.

Almost surely, 2^20261400 is an apocalyptic number.

20261400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20261400 is an abundant number, since it is smaller than the sum of its proper divisors (42550800).

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

20261400 is a wasteful number, since it uses less digits than its factorization.

20261400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33788 (or 33779 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20261400 is about 4501.2664884452. The cubic root of 20261400 is about 272.6192279092.

Adding to 20261400 its reverse (416202), we get a palindrome (20677602).

The spelling of 20261400 in words is "twenty million, two hundred sixty-one thousand, four hundred".