20545740 has 36 divisors (see below), whose sum is σ = 62322624. Its totient is φ = 5478816.

The previous prime is 20545711. The next prime is 20545769. The reversal of 20545740 is 4754502.

20545740 is a `hidden beast` number, since 205 + 457 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20545711) and next prime (20545769).

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56892 + ... + 57251.

It is an arithmetic number, because the mean of its divisors is an integer number (1731184).

Almost surely, 2^20545740 is an apocalyptic number.

20545740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20545740 is an abundant number, since it is smaller than the sum of its proper divisors (41776884).

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

20545740 is a wasteful number, since it uses less digits than its factorization.

20545740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114158 (or 114153 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 20545740 is about 4532.7408926609. The cubic root of 20545740 is about 273.8885831127. Note that the first 3 decimals are identical.

The spelling of 20545740 in words is "twenty million, five hundred forty-five thousand, seven hundred forty".