20506461240 has 32 divisors (see below), whose sum is σ = 61519384080. Its totient is φ = 5468389632.

The previous prime is 20506461137. The next prime is 20506461257. The reversal of 20506461240 is 4216460502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20506461198 and 20506461207.

It is a congruent number.

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, 85443469 + ... + 85443708.

Almost surely, 2^20506461240 is an apocalyptic number.

20506461240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20506461240 is an abundant number, since it is smaller than the sum of its proper divisors (41012922840).

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

20506461240 is a wasteful number, since it uses less digits than its factorization.

20506461240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170887191 (or 170887187 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 20506461240 in words is "twenty billion, five hundred six million, four hundred sixty-one thousand, two hundred forty".