20780454 has 16 divisors (see below), whose sum is σ = 43368192. Its totient is φ = 6625608.

The previous prime is 20780453. The next prime is 20780479. The reversal of 20780454 is 45408702.

It is a super-2 number, since 2×20780454² = 863654536892232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20780453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75154 + ... + 75429.

It is an arithmetic number, because the mean of its divisors is an integer number (2710512).

Almost surely, 2^20780454 is an apocalyptic number.

20780454 is an abundant number, since it is smaller than the sum of its proper divisors (22587738).

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

20780454 is a wasteful number, since it uses less digits than its factorization.

20780454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150611.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20780454 is about 4558.5583247338. The cubic root of 20780454 is about 274.9276018784.

The spelling of 20780454 in words is "twenty million, seven hundred eighty thousand, four hundred fifty-four".