31401620 has 12 divisors (see below), whose sum is σ = 65943444. Its totient is φ = 12560640.

The previous prime is 31401619. The next prime is 31401637. The reversal of 31401620 is 2610413.

It can be written as a sum of positive squares in 2 ways, for example, as 3818116 + 27583504 = 1954^2 + 5252^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785021 + ... + 785060.

It is an arithmetic number, because the mean of its divisors is an integer number (5495287).

Almost surely, 2^31401620 is an apocalyptic number.

It is an amenable number.

31401620 is an abundant number, since it is smaller than the sum of its proper divisors (34541824).

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

31401620 is a wasteful number, since it uses less digits than its factorization.

31401620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570090 (or 1570088 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 31401620 is about 5603.7148392830. The cubic root of 31401620 is about 315.4888521055.

The spelling of 31401620 in words is "thirty-one million, four hundred one thousand, six hundred twenty".