31542210020 has 48 divisors (see below), whose sum is σ = 66682547568. Its totient is φ = 12532531200.

The previous prime is 31542210001. The next prime is 31542210043. The reversal of 31542210020 is 2001224513.

It can be written as a sum of positive squares in 8 ways, for example, as 430894564 + 31111315456 = 20758^2 + 176384^2 .

It is a super-2 number, since 2×31542210020² (a number of 22 digits) contains 22 as substring.

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 = 31542209974 and 31542210001.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2700032 + ... + 2711688.

It is an arithmetic number, because the mean of its divisors is an integer number (1389219741).

Almost surely, 2^31542210020 is an apocalyptic number.

It is an amenable number.

31542210020 is an abundant number, since it is smaller than the sum of its proper divisors (35140337548).

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

31542210020 is a wasteful number, since it uses less digits than its factorization.

31542210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12560 (or 12558 counting only the distinct ones).

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

Adding to 31542210020 its reverse (2001224513), we get a palindrome (33543434533).

The spelling of 31542210020 in words is "thirty-one billion, five hundred forty-two million, two hundred ten thousand, twenty".