20401743631 has 4 divisors (see below), whose sum is σ = 20557482264. Its totient is φ = 20246005000.

The previous prime is 20401743617. The next prime is 20401743641. The reversal of 20401743631 is 13634710402.

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

It is a cyclic number.

It is not a de Polignac number, because 20401743631 - 2¹³ = 20401735439 is a prime.

It is a super-2 number, since 2×20401743631² (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 = 20401743593 and 20401743602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401743611) 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, 77869120 + ... + 77869381.

It is an arithmetic number, because the mean of its divisors is an integer number (5139370566).

Almost surely, 2^20401743631 is an apocalyptic number.

20401743631 is a deficient number, since it is larger than the sum of its proper divisors (155738633).

20401743631 is a wasteful number, since it uses less digits than its factorization.

20401743631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155738632.

The product of its (nonzero) digits is 12096, while the sum is 31.

The spelling of 20401743631 in words is "twenty billion, four hundred one million, seven hundred forty-three thousand, six hundred thirty-one".