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20729145290 = 257378003531
BaseRepresentation
bin10011010011100011…
…011010011111001010
31222111122112200112212
4103103203122133022
5314423130122130
613304533305122
71332454553630
oct232343323712
958448480485
1020729145290
118878075737
1240261951a2
131c5477cc59
141009089350
15814c98e95
hex4d38da7ca

20729145290 has 32 divisors (see below), whose sum is σ = 43795327104. Its totient is φ = 6915049920.

The previous prime is 20729145289. The next prime is 20729145341. The reversal of 20729145290 is 9254192702.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3999176 + ... + 4004355.

It is an arithmetic number, because the mean of its divisors is an integer number (1368603972).

Almost surely, 220729145290 is an apocalyptic number.

20729145290 is an abundant number, since it is smaller than the sum of its proper divisors (23066181814).

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

20729145290 is a wasteful number, since it uses less digits than its factorization.

20729145290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8003582.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 20729145290 in words is "twenty billion, seven hundred twenty-nine million, one hundred forty-five thousand, two hundred ninety".

Divisors: 1 2 5 7 10 14 35 37 70 74 185 259 370 518 1295 2590 8003531 16007062 40017655 56024717 80035310 112049434 280123585 296130647 560247170 592261294 1480653235 2072914529 2961306470 4145829058 10364572645 20729145290