20787340154 has 32 divisors (see below), whose sum is σ = 37202927616. Its totient is φ = 8517366000.

The previous prime is 20787340139. The next prime is 20787340193. The reversal of 20787340154 is 45104378702.

It is a super-4 number, since 4×20787340154⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 696029 + ... + 725279.

It is an arithmetic number, because the mean of its divisors is an integer number (1162591488).

Almost surely, 2^20787340154 is an apocalyptic number.

20787340154 is a deficient number, since it is larger than the sum of its proper divisors (16415587462).

20787340154 is a wasteful number, since it uses less digits than its factorization.

20787340154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31490.

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 20787340154 in words is "twenty billion, seven hundred eighty-seven million, three hundred forty thousand, one hundred fifty-four".