20131254020 has 36 divisors (see below), whose sum is σ = 42587261220. Its totient is φ = 7993575168.

The previous prime is 20131253983. The next prime is 20131254049. The reversal of 20131254020 is 2045213102.

It can be written as a sum of positive squares in 6 ways, for example, as 1676574916 + 18454679104 = 40946^2 + 135848^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20131253983 and 20131254001.

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, 348566 + ... + 402194.

Almost surely, 2^20131254020 is an apocalyptic number.

20131254020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20131254020 is an abundant number, since it is smaller than the sum of its proper divisors (22456007200).

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

20131254020 is a wasteful number, since it uses less digits than its factorization.

20131254020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53912 (or 53773 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20131254020 its reverse (2045213102), we get a palindrome (22176467122).

The spelling of 20131254020 in words is "twenty billion, one hundred thirty-one million, two hundred fifty-four thousand, twenty".