1540220020 has 24 divisors (see below), whose sum is σ = 3235486464. Its totient is φ = 615892896.

The previous prime is 1540219991. The next prime is 1540220023. The reversal of 1540220020 is 200220451.

It is a junction number, because it is equal to n+sod(n) for n = 1540219976 and 1540220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540220023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64209 + ... + 84871.

It is an arithmetic number, because the mean of its divisors is an integer number (134811936).

Almost surely, 2^1540220020 is an apocalyptic number.

1540220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540220020 is an abundant number, since it is smaller than the sum of its proper divisors (1695266444).

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

1540220020 is a wasteful number, since it uses less digits than its factorization.

1540220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24399 (or 24397 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 1540220020 is about 39245.6369549533. The cubic root of 1540220020 is about 1154.8553431647.

Adding to 1540220020 its reverse (200220451), we get a palindrome (1740440471).

The spelling of 1540220020 in words is "one billion, five hundred forty million, two hundred twenty thousand, twenty".