31401020 has 48 divisors (see below), whose sum is σ = 75790848. Its totient is φ = 10704960.

The previous prime is 31401017. The next prime is 31401037. The reversal of 31401020 is 2010413.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31400992 and 31401010.

It is a congruent number.

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, 29009 + ... + 30071.

It is an arithmetic number, because the mean of its divisors is an integer number (1578976).

Almost surely, 2^31401020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31401020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37895424).

31401020 is an abundant number, since it is smaller than the sum of its proper divisors (44389828).

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

31401020 is a wasteful number, since it uses less digits than its factorization.

31401020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290 (or 1288 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 31401020 is about 5603.6613031125. The cubic root of 31401020 is about 315.4868427132.

Adding to 31401020 its reverse (2010413), we get a palindrome (33411433).

The spelling of 31401020 in words is "thirty-one million, four hundred one thousand, twenty".