20415500031 has 4 divisors (see below), whose sum is σ = 27220666712. Its totient is φ = 13610333352.

The previous prime is 20415500023. The next prime is 20415500033. The reversal of 20415500031 is 13000551402.

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

It is not a de Polignac number, because 20415500031 - 2³ = 20415500023 is a prime.

It is a super-2 number, since 2×20415500031² (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 = 20415499980 and 20415500007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415500033) 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, 3402583336 + ... + 3402583341.

It is an arithmetic number, because the mean of its divisors is an integer number (6805166678).

Almost surely, 2^20415500031 is an apocalyptic number.

20415500031 is a deficient number, since it is larger than the sum of its proper divisors (6805166681).

20415500031 is an equidigital number, since it uses as much as digits as its factorization.

20415500031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6805166680.

The product of its (nonzero) digits is 600, while the sum is 21.

The spelling of 20415500031 in words is "twenty billion, four hundred fifteen million, five hundred thousand, thirty-one".