20461040 has 20 divisors (see below), whose sum is σ = 47572104. Its totient is φ = 8184384.

The previous prime is 20461039. The next prime is 20461061. The reversal of 20461040 is 4016402.

It is a tau number, because it is divible by the number of its divisors (20).

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, 127802 + ... + 127961.

Almost surely, 2^20461040 is an apocalyptic number.

20461040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20461040 is an abundant number, since it is smaller than the sum of its proper divisors (27111064).

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

20461040 is a wasteful number, since it uses less digits than its factorization.

20461040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255776 (or 255770 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20461040 is about 4523.3881106976. The cubic root of 20461040 is about 273.5116953379.

Adding to 20461040 its reverse (4016402), we get a palindrome (24477442).

The spelling of 20461040 in words is "twenty million, four hundred sixty-one thousand, forty".