20465540 has 12 divisors (see below), whose sum is σ = 42977676. Its totient is φ = 8186208.

The previous prime is 20465531. The next prime is 20465563. The reversal of 20465540 is 4556402.

It can be written as a sum of positive squares in 2 ways, for example, as 15808576 + 4656964 = 3976^2 + 2158^2 .

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, 511619 + ... + 511658.

It is an arithmetic number, because the mean of its divisors is an integer number (3581473).

Almost surely, 2^20465540 is an apocalyptic number.

20465540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20465540 is an abundant number, since it is smaller than the sum of its proper divisors (22512136).

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

20465540 is a wasteful number, since it uses less digits than its factorization.

20465540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023286 (or 1023284 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20465540 is about 4523.8854981089. The cubic root of 20465540 is about 273.5317450260.

The spelling of 20465540 in words is "twenty million, four hundred sixty-five thousand, five hundred forty".