20545570 has 32 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 7973376.

The previous prime is 20545531. The next prime is 20545573. The reversal of 20545570 is 7554502.

It is not an unprimeable number, because it can be changed into a prime (20545573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57051 + ... + 57409.

It is an arithmetic number, because the mean of its divisors is an integer number (1190700).

Almost surely, 2^20545570 is an apocalyptic number.

20545570 is a deficient number, since it is larger than the sum of its proper divisors (17556830).

20545570 is a wasteful number, since it uses less digits than its factorization.

20545570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522.

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 20545570 is about 4532.7221401714. The cubic root of 20545570 is about 273.8878277057.

It can be divided in two parts, 20545 and 570, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20545570 in words is "twenty million, five hundred forty-five thousand, five hundred seventy".