72020031 has 8 divisors (see below), whose sum is σ = 96184320. Its totient is φ = 47934552.

The previous prime is 72020029. The next prime is 72020059. The reversal of 72020031 is 13002027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72020031 - 2¹ = 72020029 is a prime.

It is a super-2 number, since 2×72020031² = 10373769730481922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72022031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17535 + ... + 21248.

It is an arithmetic number, because the mean of its divisors is an integer number (12023040).

Almost surely, 2^72020031 is an apocalyptic number.

72020031 is a deficient number, since it is larger than the sum of its proper divisors (24164289).

72020031 is a wasteful number, since it uses less digits than its factorization.

72020031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39405.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 72020031 is about 8486.4616301495. The cubic root of 72020031 is about 416.0553408101.

Adding to 72020031 its reverse (13002027), we get a palindrome (85022058).

The spelling of 72020031 in words is "seventy-two million, twenty thousand, thirty-one".