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20615891490146 = 2197922330795451
BaseRepresentation
bin1001011000000000000101…
…11000111001010101100010
32200222212012220221220102002
410230000002320321111202
510200232321210141041
6111502450530124002
74225310003222651
oct454000270712542
980885186856362
1020615891490146
116629172322367
12238b5b8420602
13b670bb394444
14513b58ca9198
1525b3eee1359b
hex12c002e39562

20615891490146 has 32 divisors (see below), whose sum is σ = 33111269990400. Its totient is φ = 9598572219600.

The previous prime is 20615891490133. The next prime is 20615891490169. The reversal of 20615891490146 is 64109419851602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20615891490091 and 20615891490100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14728280 + ... + 16067171.

It is an arithmetic number, because the mean of its divisors is an integer number (1034727187200).

Almost surely, 220615891490146 is an apocalyptic number.

20615891490146 is a deficient number, since it is larger than the sum of its proper divisors (12495378500254).

20615891490146 is a wasteful number, since it uses less digits than its factorization.

20615891490146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30795774.

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 20615891490146 in words is "twenty trillion, six hundred fifteen billion, eight hundred ninety-one million, four hundred ninety thousand, one hundred forty-six".

Divisors: 1 2 19 38 79 158 223 446 1501 3002 4237 8474 17617 35234 334723 669446 30795451 61590902 585113569 1170227138 2432840629 4865681258 6867385573 13734771146 46223971951 92447943902 130480325887 260960651774 542523460267 1085046920534 10307945745073 20615891490146