20355415031 has 4 divisors (see below), whose sum is σ = 23263331472. Its totient is φ = 17447498592.

The previous prime is 20355414979. The next prime is 20355415037. The reversal of 20355415031 is 13051455302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20355415031 is a prime.

It is a super-2 number, since 2×20355415031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20355414985 and 20355415003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355415037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1453958210 + ... + 1453958223.

It is an arithmetic number, because the mean of its divisors is an integer number (5815832868).

Almost surely, 2^20355415031 is an apocalyptic number.

20355415031 is a deficient number, since it is larger than the sum of its proper divisors (2907916441).

20355415031 is an equidigital number, since it uses as much as digits as its factorization.

20355415031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2907916440.

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 20355415031 in words is "twenty billion, three hundred fifty-five million, four hundred fifteen thousand, thirty-one".