31340401820 has 96 divisors (see below), whose sum is σ = 82726576128. Its totient is φ = 9707657472.

The previous prime is 31340401811. The next prime is 31340401853. The reversal of 31340401820 is 2810404313.

31340401820 is nontrivially palindromic in base 3 and base 9.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 31340401820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97652 + ... + 268731.

It is an arithmetic number, because the mean of its divisors is an integer number (861735168).

Almost surely, 2^31340401820 is an apocalyptic number.

It is an amenable number.

31340401820 is an abundant number, since it is smaller than the sum of its proper divisors (51386174308).

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

31340401820 is a wasteful number, since it uses less digits than its factorization.

31340401820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366459 (or 366457 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 31340401820 in words is "thirty-one billion, three hundred forty million, four hundred one thousand, eight hundred twenty".