20634031240 has 32 divisors (see below), whose sum is σ = 47681345880. Its totient is φ = 8030541312.

The previous prime is 20634031189. The next prime is 20634031273. The reversal of 20634031240 is 4213043602.

It can be written as a sum of positive squares in 4 ways, for example, as 20620385604 + 13645636 = 143598^2 + 3694^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6969477 + ... + 6972436.

Almost surely, 2^20634031240 is an apocalyptic number.

20634031240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20634031240 is an abundant number, since it is smaller than the sum of its proper divisors (27047314640).

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

20634031240 is a wasteful number, since it uses less digits than its factorization.

20634031240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13941961 (or 13941957 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20634031240 its reverse (4213043602), we get a palindrome (24847074842).

The spelling of 20634031240 in words is "twenty billion, six hundred thirty-four million, thirty-one thousand, two hundred forty".