20154312020 has 24 divisors (see below), whose sum is σ = 42326911368. Its totient is φ = 8061180800.

The previous prime is 20154312019. The next prime is 20154312041. The reversal of 20154312020 is 2021345102.

It can be written as a sum of positive squares in 4 ways, for example, as 5098531216 + 15055780804 = 71404^2 + 122702^2 .

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 = 20154311983 and 20154312001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413330 + ... + 459510.

It is an arithmetic number, because the mean of its divisors is an integer number (1763621307).

Almost surely, 2^20154312020 is an apocalyptic number.

20154312020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20154312020 is an abundant number, since it is smaller than the sum of its proper divisors (22172599348).

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

20154312020 is a wasteful number, since it uses less digits than its factorization.

20154312020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68011 (or 68009 counting only the distinct ones).

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

Adding to 20154312020 its reverse (2021345102), we get a palindrome (22175657122).

The spelling of 20154312020 in words is "twenty billion, one hundred fifty-four million, three hundred twelve thousand, twenty".