20540670 has 32 divisors (see below), whose sum is σ = 50447232. Its totient is φ = 5349792.

The previous prime is 20540651. The next prime is 20540699. The reversal of 20540670 is 7604502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20540670.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6672 + ... + 9251.

It is an arithmetic number, because the mean of its divisors is an integer number (1576476).

Almost surely, 2^20540670 is an apocalyptic number.

20540670 is an abundant number, since it is smaller than the sum of its proper divisors (29906562).

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

20540670 is a wasteful number, since it uses less digits than its factorization.

20540670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15976.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20540670 is about 4532.1815938905. The cubic root of 20540670 is about 273.8660524185.

The spelling of 20540670 in words is "twenty million, five hundred forty thousand, six hundred seventy".